Headlights

[jwgriffin]

I could use some help, my fire department runs AM General 5 ton and 2.5 ton trucks. We are having issues with one of our trucks lights shutting down, we have changed the switch and the dimmer switch thought it was fixed but it has once again proved us wrong. I have not done much searching on it but it is a 1985 were these ran on a relay system? Has anyone had any issues or dealing with this type of issue? Thank you in advance.

 

[porkysplace]

You need to be more specific what is the M number of the truck ?
2 1/2 ton or 5 ton ?

 

[gimpyrobb]

All lights shut down or just headlights?

 

[Farmitall]

Do the lights come on in time after a shutdown? Is there a thermal breaker in the circuit? Is there a loose ground? Have you checked for short circuits in the wiring harness where it might be chaffing to ground?

These are things I'd check first considering its happening in one of four trucks which I would assume are the same?

 

[dmetalmiki]

As previously mentioned. It is helpful to give comprehensive details of a problem. Even better when the full model number and year is given, as is a full description of the symptom. the symptom duration. and is the symptom a re occurring one?.
Just guessing from the brief details you gave 'suggests', that the by-metal relay in the thermal cut out is operating properly, (preventing a fire in the process!) as you have a dead short somewhere in the lighting circuit.
A frayed or worn through electrical harness could cause that, An earthed (grounded) 'live wire' Also. A host of things are 'probable'. You have to start and work through possible causes methodically, (disconnect individual items? ). Consider The actual operating switch being corroded inside and shorting out. Go to it! Report back when you find the fault and complete the fix.

 

[mdainsd]

Well, one post and done....

 

[Farmitall]

It would be nice to know what was found and what was done to correct the situation.

 

[dmetalmiki]

Thermal bi-metal cut out is my guess. Let us know in any case. So that other members may benefit from your experience.

 

[Big Tom]

I think his lights are out

 

[BEASTMASTER]

now that's funny