[CookieMonster]

So I go out to start up my '94 Pete cabover and as soon as I turn the key to the start position-NOTHING! No low air warning buzzer, no dash lights, no accessories, nothing. It's like the cab has no electrical power at all. The interior light came on for a few seconds and then faded out never to come back on again. I thought it was the batteries so I tried to jump it to no avail. I pulled all four batteries and tested them and they all read fully charged. The battery posts and connections are all clean. So this leads me to believe that a connection is loose or maybe a main fuse is bad. Am I on the right track? This truck has started religiously no matter how cold for as long as I've owned it (about a year and a half) and has been bullet proof reliable until now. Anyone have any ideas? Thanks.

[bikerboy]

check your ground from the batteries to the frame

[GMAN]

Your ground would be the most suspect, especially if your batteries are charged. I would check all cables starting at the batteries.

[Roadhog]

Yep, what they said.
This is the no.1 place to look.
Lots of vibration loosens even breaks this connection.

[Jackrabbit379]

Yeah, I would check the ground.
If not that, it might be the mother board. The grandmother of them all that runs the whole kit kaboodle. :hellno:

[CookieMonster]

Okay I'll check the ground. Thanks for all your suggestions.

[Roadhog]

From your discription, (no accessories) just seems most likely ground strap to the frame. Next suspect for me would be the starter switch, then main fuse.

Is there a battery cutoff switch?

[Maniac]

Your battery cables may be bad, especially if they are the original ones, some times they corrode from the inside out, ask me how I know :-)