86 M1008 No lights...again?

[smokeeater495]

I recently replaced the headlight switch on my 1986 M1008. I started it up on a cold morning and heard a "snap" sound from under the dash. I came back out a few minutes later to take off, pulled on the switch, no lights anywhere on the truck. Yes I understand how the blackout switch works. I researched on here and determined all lighting power goes through headlight switch. Installed new switch, all lights worked fine. I went out to start it this morning, cold 9f, no lights again. The heater blower motor does work. Help will be greatly appreciated.

 

[Midnight Rider]

It might be time to just replace the headlight harness with a new one. Before I sold mine, I kept losing my turn signals/headlights. I replaced the headlight switch thinking that was the culprit, but it didn't help. I just ended up ordering that heavy duty headlight harness kit from LMC and put it in. It was easy enough to install and it solved the issue. That was alot easier than trying to go through all of the wires to find the problem child.

 

[smokeeater495]

I'm putting my money on the fuse holder, it's ass deep in snow right now, will check later. Also ordering the LMC HD harness. The TM's were very helpful.

 

[1956_4x4]

These trucks have a history of the fuse boxes going bad. They get a high resistance connection between the fuse and the holder and result in a melted fuse box. It would be a good thing to check.

Smitty

 

[smokeeater495]

The problem was a resettable 30 amp fuse that the breaker failed on. The fuse box itself was in good shape, no sign of resistance heating. Replaced with regular 30 amp fuse, good so far. I ordered the LMC relay harness yesterday. Going to try to install block heater and doghead's starter relay mod. tomorrow.

 

[D10]

io had that happen too had to have fuse box rewired