Freightliner headlight relay location

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For a better experience, please enable JavaScript in your browser before proceeding. Freightliner Wiring Diagrams or Repair Manuals. I'm completely new to this field, have little to no experience in working on these trucks. However, I'm jumping straight into it. Call me stupid, ignorant, or a fool, I'm 26 years old and a recently laid off oilfield Operations Manager, who really just wants to get his own thing going.

I also bought a 15' 14yd dump body, reinforced the frame, extended frame about 1' 6", and have recently converted it to a dump truck. Now I'm trying to fix the other, small but important problems with the truck. I have had hell trying to find any kind of documentation on the wiring of these trucks. Cruise control, exhaust brakes, speedometer, and tach are all not working.

Speedometer doesn't seem to work. Maybe up to about 65mph, then it will stick and won't come back down until it shows 45mph. Tach sticks around 5x rpm even with engine off, comes up to about 6x rpm at idle, but doesn't seem to be accurate. I have been told to check all the ground wires, but don't know how I could possibly do that with no reference to where they are.

I figured I might just try to replace the speed sensor on the back of the transmission for the speedometer, but I would like to try to get some advice first. I cannot find the sensor for the tach. I was told it should be on the bell housing, but can't see where it would go. I have only found 4 wires not connected to anything. Two wires are in a set with a connector and the other two wires are separate with their own connectors. Also, behind the panel which contains the radio housing, trailer and tractor parking brakes, has 5 wires which aren't connected to anything too.Wolf0r Top Member.

USA Posts. Harrison Fire Senior Member. United States Posts. Spar Active Member. I have checked all ground and power studs on firewall.

freightliner headlight relay location

Follow it and you will probably find a loose or corroded cable. Your lighting power may share the same source. I don't have a diagram handy to verify this. Have found that the intake heater relay power is not the problem.

I disconnected the power at relay and problem cont. Unpluged ECM control wire or remove intake heater light bulb from dash claster I no have no headlights. I have replaced headlight switch, daytime running lights mod. I have had that one get loose with the stud almost cooked through. HF My Fleet? There is a connecton or a wire can't remember which that either comes apart corodes or something. It's been a couple of years but I had the same problem and that is what I found.

I think it's the right hinge but don't hold me to that. Good luck. Do the headlights and intake heater relay share a common ground point, or power point?With that in mind, it can be tremendously useful to start off by looking at whether both, or just one, of your headlights have failed, and whether or not the high or low beam mode still works.

When headlights stop working, it's usually an electrical problem or an physical issue with the bulbs themselves. In order to get to the bottom of the situation as quickly as possible, it's important to make note of exactly what type of failure you have experienced.

Based on which bulbs have stopped working, and under what circumstances, you can use the following information to narrow down a solution:. Most total headlight failures are caused by a bad component like a fuse, relay, or module.

Wiring problems can also cause both headlights to stop working. If just one bulb fails to work in either high beam mode or low beam mode, it may be the bulb. Most headlight failures that are limited to just high or low beams are related to a relay or the high beam control switch. If your headlights always seem dim, the problem could be foggy lenses or worn out bulbs.

If your headlights seem to dim during specific circumstances, there may be a charging system issue. Other headlight problems are also caused by some combination of bad bulbs, wiring or relay problems, and bad switches.

Most headlight systems are pretty straightforward and include a few basic components like the bulbs, a relay, a fuse, and a switch.

There are variations on this basic theme, like some vehicles have daytime running lights, adaptive headlightsor other little wrinkles like fog lightsbut the idea is still the same.

When you turn on your headlights, that switch activates a relay. That relay, in turn, actually provides the electrical connection between your headlight bulbs and the battery.

Fuses are also involved in order to provide a sacrificial failure point to protect the rest of the wiring. In the same way that your headlight switch activates a relay to provide power to the headlights, operating your high beam control will generally activate a relay to turn on the high beams.

In the case of dual filament headlight capsules, this literally sends power to the high beam filament. If any of these components stop working properly, your headlights will fail. And by looking at the way they failed, you can usually backtrack to figure out the best place to start troubleshooting. Fixing a burned-out headlight is usually a pretty easy job, but there are cases where you may want to go straight to a mechanic. If you don't own some basic tools and diagnostic equipmentlike screwdrivers and a voltmeter, then you may want to think about taking your car to a professional during daylight hours.

If you do take your car to a shop, they'll probably start with a visual inspection of the headlight system, check your fuses, and take a look at the switch and relays.

Replacing a burned out headlight usually only takes a few minutes, but the diagnostic procedure could take between half an hour and an hour, or even more, if you're dealing with a more complicated problem. The diagnostic procedure that a professional technician will actually follow is similar to the one outlined below.

So if you want to know more about what to expect when you take your car in to have your headlights fixed, you may want to read on. When one headlight stops working, and the other one works just fine, the problem is usually just a burned-out bulb. If the connector has come loose, pushing it back on may fix the problem. Another factor to take into account before you replace a burnt-out headlight capsule is whether or not there were any outside causes for the failure.

Regular halogen capsules can last anywhere from to 1, hours. One easy thing to look for is any water or condensation inside the headlight assembly. If the seal is worn out or deteriorated, or the housing itself is cracked, water can easily get inside.

freightliner headlight relay location

When that happens, the operational lifespan of your headlight capsule will be severely compromised, and the only fix is to replace the headlight assembly. Traditional halogen headlight failures are usually pretty straightforward, but things can get more complicated when you're dealing with xenon or HID headlights.

Although it is possible for an HID bulb to burn out, there are several other potential points of failure that you have to look at.Discussion in ' Freightliner Forum ' started by skinzJul 5, Log in or Sign up.

Find Trucking Jobs. Need wiring diagram for a 96 - 97 Freightliner Classic!!! Jul 5, 1. Can anyone make a copy of theirs? Is there a fusebox anywhere because behind the panel there are only breakers and relays but no fuses? Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided. There is no charge for this service, but standard message and data rates may apply.

Jul 5, 2.

Cascadia Driver's Manual

It's all in that center panel. They don't use fuses, just relays and those circuit breakers that automatically reset. Any fuses were added by someone else. What circuit are you looking for? I can look up the wire number. There are several diagrams depending on options such as DRLs, engine brand, etc.

Semi CrazyJul 5, Jul 5, 3. There are pages and pages of diagrams for that truck. Need vin and component. Otherwise I suggest paying a one day fee to Mitchell's tractor-trailer. Shaggy76Jul 5, Jul 10, 4.

Hey Ya'LL thanks for the replys. My VIN is My problem is when I turn off the ignition my guages dont drop and its sucking my battery juice when turned off. Are they connected to a relay or circuit breaker?

Jul 11, 5. Key switches wear out and they are cheap. Try disconnecting hot wire from key switch and see if gauges turn off. If you don't own a test light already, buy one. Semi CrazyJul 11, Intothesunset and skinz Thank this.Page of Go.

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Freightliner Business Class M2 Fuse Box Diagram

Table of Contents. Page 3 Foreword defect exists in a group of vehicles, it may order a recall and remedy campaign. Page 7: Emission Labels B-pillar as shown in Fig. Record the number so a duplicate key can be made, if needed.

Page 14 Vehicle Access NOTE: You can also use the inner door grab handle, if available, as a support when getting up or down from the bottom step. Make sure they will not ness could cause a person to trip and fall, with get in your way as you exit. Always face in when exiting the cab.

Do not at- Move your right hand to the B-pillar grab handle. Place your other foot on the top step. Move your lower hand to a higher position on the grab handle.

Step onto the deck plate. Climbing Down from Back-of-Cab To climb down from the back-of-cab area: Grasp the sidewall grab handle with both hands. Page 20 Vehicle Access These fuse boxes contain mini blade-type fuses, volt mini relays, and volt micro relays. Bulkhead Module 2. Main Fuse Box Fig. Page 21 Instruments Instrumentation Control Unit The instrumentation control unit ICU provides the driver with engine and vehicle information.

It is com- Ignition Sequence prised of standard and optional gauges, an audible warning, a driver message center, and a lightbar con- When the ignition is turned on, the ICU runs a self- taining warning and indicator lamps also known asAll Postings that advertise items for sale will be deleted from the Discussion Forum. You may post sale items for free in the Classifieds section. Sign up now. Re: freightliner fuse bl;ock and wiring harness.

We need a fuse block and wiring harness for our Itssca Sunflyer. Freightliner gave me a parts number but the local dealer could not help me.

freightliner headlight relay location

Does the fuse block have the wiring harness attached? Where do I but these things? Do I need special tools? Fuse block parts no. Thanks Susan.

I have no brake lights, I have turn signals left and right and four way signals. Any body have a wireing diagram. I'm looking for a jake brake wiring diagram for a frightliner with detroit diesel. I need the wiring diagram for a freightliner day cab tail,brake,turn signal,light. I need a freightliner fld mid- roof with detroit 60 series. Ranch hauler. The battery's will discharge in 4 or 5 days when not in use. I disconected the two postive battery cable's when I reconected them the larger one didnot spark but the small one did.

How do I find the draw on the dattery's? I need a diagram for freightliner w detroit 60 a diagram for the ignition swith,start botton,shotdown botton and battery boost botton. Dash lamps inop. I need the wiring diagram for the 2 6volt battries for a Damon Ultrasport. I have a red wire hota black wire ground and white wire?

What to Do When Your Headlights Stop Working

I hooked up the battries in a series leaving the white wire off. After 3 days the battries are drained. I need to hookup the white wire. Looking for the horn relay and wire diagram. Thanks Lyle.

He need wiring diagram for hook up my control brake on my new MH with xc chassis freiliner and where his the wire in the dash thank. I have a Dutch Star on a Freightliner chassis with a Cat engine. Engine will not start it does turn overappears to be no power to fuel pump. Slide will not operate, steps will not operate, no turn signals, no stop lights, radio does not operate. Everything worked a week ago. Need wiring diagrams for engine and coach and any suggestions anyone has to diagnose.

When I turn my head light lights on my running light do not come on,but when I turn on the running lights on they come on. Any ideas. I have a freightliner columbia. When I turn on my head lights none of my running lights come on,but when I turn on my running lights come on. Any idease anyone.As complicated as they may seem automobile headlight systems are little more complex than the light switches in your home.

Turning on a light switch in your house closes the electrical circuit between the house power and the light, causing the light to turn on. Automotive headlight systems are a bit more complicated, because you need a smaller "switch" to flip the larger one.

A relay uses a tiny bit of power from the headlight switch on your dashboard to "flip" another, bigger switch, which turns the headlights on. They're generally pretty reliable, but will eventually fail with time and use. Turn on your lights.

freightliner headlight relay location

If only one light comes on, the relay is OK and you probably have a bad headlight. The relay operates both headlights. Open the hood, locate the fuse box with the headlight relay or relays, and open it. Put your ear close to the relay and listen. Alternately, you can wedge the handle of a long screwdriver into your ear, and touch the screwdriver point to the relay. You can hear the relay click though the screwdriver like a stethoscope. Have an assistant turn on the headlights.

The safest way to test a headlight relay is to replace it with a known good one. Alternately, you can remove a working relay from elsewhere in the box and plug it into the headlight relay socket. Most vehicles use several interchangeable relays in the same box; check the number stamped on top to make sure they the same before you start pulling them. You can test the relay with a multimeter, but you have to know how to use it. Pull the relay out of its socket and check across the coil with the ohmmeter section of the multimeter.

If it's over that, replace the relay. Identify the "85" ground terminal and "86" power terminals on the relay. Look in the fuse box and find the corresponding holes. Set your meter to read in "Volts DC," and touch the probes to the corresponding ground and power terminals in the box.

You should see about 12 volts with the headlights turned on, and nothing with them off. If you see this voltage, but the headlights still aren't working, replace the relay.

If you don't get a voltage here, check to see if you have a blown fuse or bad power connection elsewhere. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Works, contact us.

Replace the Relay Have an assistant turn on the headlights. Multimeter Tests You can test the relay with a multimeter, but you have to know how to use it. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.


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