Electrical Dilema

Until now I have not been stumped by electrical issues with all my 77 Dodges.

M880

Don't work:
Parking lights(taillights), front, back or side
Instrument lights.

Does work:
everything else

Have power at fuse
light switch checked
searched for loose connections.

Now I'm trying to find where that circuit grounds at?????????

If the vehicle has the Mwo with black out lights, check the wiring under the fuse block on the dash top. lotsa problems there, also where the wiring harness enters the firewall over the driver's left foot...

If power is coming out of the back of the switch, It's probably an open circut [broken wire] close to the switch or just before a splice.

Re: RE: Electrical Dilema

badgmc56 said:

If power is coming out of the back of the switch, It's probably an open circut [broken wire] close to the switch or just before a splice.

Click to expand...

Easier said then chased

What a PIA

can hardly wait to dig into a short in the same circuit of the W400
but I need the services of the M880 this weekend

RE: Re: RE: Electrical Dilema

I don't remember the exact symptoms, but I recall shortly after I installed the black out light kit, one of the relays that came with the B/O light kit suffered a premature death and burned out causing me to lose my lights (as I said I can't remember specific details.) Luckily the B/O light kit came with a spare relay used on the ambulances so I swapped that relay in and the lights worked again. Problem solved. The relay in question was the one that IIRC the kit instructions has you mount under the dash on the driver side near the parking brake. Might be worth investigating. Could be a quick easy fix for you.

RE: Re: RE: Electrical Dilema

Theres a Relay mounted next to the fuse box for the parking lights, when you turn the light switch on you sould hear it click if not full the glove box out you'll see the relay right there check the power there when you activate the light switch, i had the same thing happen to my truck.

P.S. leave the humvee tires on your truck looks cool that way

Just a tip on your teminology, a "Short" in a circuit will blow a fuse, an"open" in a circuit is a broken or disconnected wire. A good test light and some time should get your problem solved

I lost all the lights to the rear of my truck once, I had to replace the turn signal switch to fix them because the power for the lights ( at least to the rear) runs threw the turn signal switch....but I dont think I lost the front parking lights.

( cant remember )

There is a write up on this issue on another forum. I will try to find it.

I see you have been there already, great bunch of guys over there at power wagons advertisers forum :

http://powerwagonadvertiser.com/forums/forumdisplay.php?f=5

hope they can help you out, I have no clue what to tell you with the front running lights....

Fixed!
Relay between fuse box and glove box