Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Good morning Doug sorry for delay do you still need assistance with this?
Let me know I'll be around most of the day
Paccar uses a main breaker that feeds accessory circuits through/to the fuse panel ,you need to start there.
The breaker will be either inside frame rail by starter (either side passenger or drivers) or in battery box, you can follow the six gage cable that comes off the positive battery post and goes to breaker, either test both sides for power or jump breaker to test
that breaker has power.
also test your fuse/breaker panel and make sure both sides and top and bottom have power,, use a volt meter if test light is dim
No those fuses feed engine/trans electronics and go directly to battery positive
you are looking for 2 big breakers, two post, both have larger wires to both sides that feed the entire fuse box
with key on jump that solenoid (outer big post) you talked about in first reply, this may have the accessory solenoid on it
You also need to know if all fuses have power going through them, (both sides of fuse} even if fuses are okay that will tell us which direction to go either before or after
let me know what you have checked and confirmed
When you get a chance what engine make and model do you have and is trans electronic (auto shift)?
I need to know if entire fuse box has at least 12 v to all breakers/fuses?
Are you referring to ignition breaker in last reply?
Do you know have all gages heater ect in cab with key on?
on the picture of breakers you should only have two inside rame or in battery box
Off battery positive post do you have a 6 gage cable that comes off it?
If you do follow that cable to breaker or solenoid
click here for engine wiring
click here for breaker I'm referring to, bottom left side of page,, it comes off either battery positive or starter terminal big cable, it feeds all power to fuse panel
not the battery cables they are either 00/4 or 00/2 cables, the cab power is a little smaller in diameter about the same as car battery cable
so do you have more than one cable to any positive terminal on battery where one is a little smaller than the other cables?
Here' s the other breaker probably the one you found with broken terminal.
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