Fuse panel diagram for 99 Peterbilt 379

Here is a possible wiring diagram for the voltmeter on a 1996 Peterbilt 379 with a C15 engine:

1. The voltmeter gets power from the battery through a 5A fuse (F2) and a 10A circuit breaker (CB7).
2. The voltmeter is grounded through a ground wire (GND) connected to the chassis.
3. The voltmeter receives the signal from the alternator through a wire (ALT) connected to the alternator "sense" terminal.
4. The voltmeter also receives a signal from the ignition switch through a wire (IGN) connected to the ignition switch "ACC" terminal.

Here is a possible wiring diagram based on this description:
Battery positive (+) ---[F2]---[CB7]--- Voltmeter (+) ' ' Battery ground (-) -------------[GND]--- Voltmeter (-) ' ' Alternator "sense" terminal ---[ALT]--- Voltmeter signal input ' ' Ignition switch "ACC" terminal ---[IGN]--- Voltmeter signal input
Note: This is just a possible wiring diagram and may not reflect the exact wiring configuration in your specific vehicle. It is always recommended to consult the wiring diagram provided in the vehicle's service manual or consult a qualified mechanic or electrician for assistance.

See if this link will get you what you want.


wiring diagram 03 peterbilt 379

We would have the same fuse diagram. so can't really help.

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hope that will help.

I’m happy to help further over the phone at https://www.6ya.com/expert/dennis_7c5f8bf265aab5e9

I'd suggest that you use a voltmeter to check if there is power on the positive (supply) side of the fuse panel, and I'd be betting that there isn't.
- Chances are that there will be a relay that is activated when you turn on the ignition, and either the ignition switch, wire, relay, or wire to the relay is not functioning.
You'll need to trace it through.
Hope this helps.

http://www.peterbilt.com/.../Supplemental%20Manuals/.../Supplementa...

Pull the fuse box off of the piller and look behind it there is corrosion o the relays I bet . FYI

Where is winshield washer motor fuses on peterbilt 379

look for broken plastic pieces under the pedal. could be a broken brake light switch located on the back of the brake pedal