Electrical gremlin lost all lights, radio memery, everything that is hot 24/7

[625fireman]

So this morning started GREAT.
Everything that is supposed to be hot 24/7 is dead.....
all lights, head, marker, dome, dash.... etc
radio memory
radio
clock

dug into it I have power at the junction block on the firewall, all the fusible links are good, power on the 8 gauge (IIRC) red wire going thru the firewall.

That is as far as I got though ended up late to work by an hour, ( borrowed dads truck)

Any one got any ideas on where to go next????????

 

[racedaymechanic]

So this morning started GREAT.
Everything that is supposed to be hot 24/7 is dead.....
all lights, head, marker, dome, dash.... etc
radio memory
radio
clock



dug into it I have power at the junction block on the firewall, all the fusible links are good, power on the 8 gauge (IIRC) red wire going thru the firewall.

That is as far as I got though ended up late to work by an hour, ( borrowed dads truck)

Any one got any ideas on where to go next????????

Where are you grounding with your test light? if its grounded to the Battery then it will tell you nothing, Ground to the engine and test then ground to the Body and test, I suspect you have a bad ground

 

[Burning oil]

Check the ground under driver side battery.

 

[625fireman]

Test light was on both battery and body made no difference same readings.
In my hasty (pissed off) mood when I posted this am I forgot to mention everything else works fine..................
Starts up fine,
drives,
shifts,
blower motor works,
wipers,
brake lights,
gauges read,
turn signals,
etc......

I dont remember a ground under the battery but will look for that one.

 

[ak diesel driver]

ign switch?

 

[625fireman]

Nope not switch either.
5 hours later got it fixed..................
Finally found it after tearing the dash apart and chasen wires back, there is a plug connection behind the glovebox that got too hot. It is not in the GM repair manuals though. I looked and looked thru them and it showed every power supply coming in thru by the colmunm. Apearntly cab and chassis have a different power feed setup. I looked at my other 94 c&c and it has the same setup. It is a black connector with 3 wires in it. One red 8 gauge and 2 smaller wires. This power feeds the radio memory,clock, and lights. So FYI to all the cab and chassis owners the GM repair manuals dont always pertain to our trucks. Oh well nother lesson learned on the 6.5's..............................

 

[Burning oil]

OH!! if you would have said it was a C&C I could have told you that was the problem, Yea right.

Glad you got it fixed.

 

[JiFaire]

LOL @ Leroy ... good work, troubleshooting, Joe!

 

[Brooklyn Tow]

Take a few pics Joe....If it's not already back together.

Us C&C guys need all the help we can get!

Glad you found it!

 

[625fireman]

Yep Louis its back together, but aint hard to find the plug right in with the ECM and VSB bout the size of a Zippo. 3 wires in and 3 out. black plug. I will try to get a pic next time I am in there, need to blower motor sometime it dont work on low or medium.

Thanks for the input guys.