headlight problems

[blainepowell]

All lights work except the headlights no high beams or low beams. I checked the voltage at the plug and I'm getting about 24 volts. New to the cucv m1009 never had a military truck before and I'm not sure what i should check first any help would be great, thanks

 

[treessw]

Don't forget to introduce yourself!!!! Read all your TM's. Sometimes with the CUCV try flashing between the high beams and your low beams, sometimes it will get them to kick on (have to do it with mine every once in a while), than look into your connections. If its electrical, clean it. If its rubber, replace it.

BTW- Enter your location in full.
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[OldDominionIron]

Pull the headlight out and check to see if you're getting voltage at the light.

 

[treessw]

Yeah that to!!!!

 

[blainepowell]

I pulled the headlight out and I'm getting 24 volts at the plug. I have tried several times to switch from high to low beams and still get nothing.

 

[blainepowell]

Thanks, Blaine Powell
Griffith, Indiana

 

[NDT]

I pulled the headlight out and I'm getting 24 volts at the plug. I have tried several times to switch from high to low beams and still get nothing.

If you're getting 24 volts at the headlight, that's your problem! The bulbs are 12 volt and 24 will burn them out in seconds.

 

[Evil Dr. Porkchop]

cucvs have 12 volt lights

is the headlight burned out?

 

[blainepowell]

I'm pretty sure the headlight is burned out I have new 12 volt headlights i cant find 24 volt to fit but i thought this truck only had 24 volts for starting and the rest of the truck was 12 volts. Sorry I should have mentioned that in the first post. So I'm not sure if I should keep pursuing 24 volt headlights or if there is a voltage problem.

 

[Evil Dr. Porkchop]

I vote voltage problem, you should only have 12 volts at the plug

 

[blainepowell]

Do you know where I should check for the voltage problem and do you know where the voltage steps down at? I looked at some of the TM's schematics and wasn't quite sure how to read them I guess, thanks.

 

[blainepowell]

Do you know where I should check to correct the voltage. Do yo know where the voltage actually steps down from 24 volts to 12 volt at ?

 

[deuceaid]

It doesnt step down, it is pulled from the center of the 2 batteries. When You are checking the voltage , where are You grounding Your meter?

 

[blainepowell]

checked voltage at socket once with a power probe hooked to the battery and the second time i checked it was with a volt meter using the sockets ground terminal.

 

[papakb]

wiring

In a regular M series truck the wires marked 17 and 18 are your high and low beam power leads. The wire marked 91 is the ground lead and if it isn't connected you can feed all the juice to the headlights you want and they won't light up. Check your ground wire.

Kurt

 

[fuzzpuss]

I am having the same problem that originated when my big power cable to the starter rubbed against the block and shorted out, the starter, then ground wires here and there. I have no headlights, but got power to the plugs for the lights themselves, I also have all lights running at 24 volts... now what could that be?

 

[MarcusOReallyus]

i thought this truck only had 24 volts for starting and the rest of the truck was 12 volts.

That is correct. If you are seeing 24v at the headlight plug, you have major problems. Start reading the TMs; you need to understand the system before you can troubleshoot it.