Peterbilt 387. Dead batterys again.

Any luck on the voltage drain?

 

Whoa there, what are you talking about - it kills the kill switch.

You have it hooked up to the starter too?

 

well go get a Cole Hershey model M-750, you can order it online. Don't mess with anything else.

THEN wired it into the system from the batteries EXCEPT remove all the other connections that are on the starter post from the battery. This will isolate your starter and the switch won't be part of the starter circuit.

You won't burn this switch up, you are isolating the entire truck system off the batteries.

 

Did u ever end up finding out what the issue was? I'm kind of going thru the same problem in my peterbilt 589. Changed out the batteries, brand new alternator, 2 heavy duty kill switches.... still after 2 or 3 days of not driving.... dead batteries. Frustrated would be an understatement.

 

Very old thread but...

A kill switch is simply a switch between the batteries and the rest of the electrical system.
Don't you run the cables from the batteries to the switch, then to everything else?
Why would anything be excluded to run around that?

If the cables to the switch can handle the load of everything else after that, how would turning the switch off cause any sort of problem?
It would just be the batteries to a dead end at the switch. The batteries to two unconnected cable ends, like an extension cord with nothing plugged in.

The starter motor may cause the switch to burn out sooner if it is included in that setup. I think I had that problem with an old Volvo years back.
But if the starter is the only thing excluded from the kill switch, then the problem lies there.

 

You good sir, have given me some hope. Though I usually take my truck to my regular guy, (Hispanic gentleman, not so good with english) who with all due respect does and optimal job with other mechanical issues, but seemed confused and said bring the truck anyway). I think um just gonna go to the pete dealership ("Rush" here in Houston) and pay a lil extra to get it diagnosed once in for all, knowing the complicity that comes with electrical drain issues. Thank you I find your shared experience helpful.

 

3 batteries won't make 36 volts unless they are wired in sequence. If the cables connecting the batteries to each other in parallel as you described are large enough then it won't cause any issues. That's the normal way to do it. Loose connections do indeed cause problems though.