Where is the cruise Serv switch on a Peterbilt 379?
Brake light, cruise serv br switch, and low air are located on floor right beside fuse panel. Pull the plastic panels off behind cluctch pedal and brake pedal. They are known for w shield leaking and it’s all aluminum. Block that they go into. Corrosion gets to wire ends lots of times
Where is the break lamp switch on a Peterbilt?
Searched in dash and under bunk. If you post the vin I can pull it up but if memory serves its and air psi switch. There Ius one one the fire wall side under the foot pedals. For the break lamp switch. The micro switch for the clutch also will keep these functions off. Good luck
How does ABS work on a Peterbilt 379 MHH?
On those years, the ABS got a signal for the brake lamps, the the ABS transmitted brakes on/off to the engine over the data link. I’m not sure how yours are wired, they changed a lot in 2005.
What was the problem with the Peterbilt lights?
My driver just went in to Peterbilt in Springfield, MO with the same problem but it also affected his top trailer lights and some on the rear. It was one of the silver fuses and I think it was just loose a little. The service manager came out and bent the ends a little and that fixed the problem WITH NO CHARGE.
Why are my turn signals on Peterbilt not working?
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Why does the engine fan keep coming on and off?
The engine fan will only stay on for a few reasons. Mosf of the time the fan clutch solenoid is bad. It is an electric solenoid that turns the fan on and off. You can find it by following the air line that comes from the fan clutch hub. In you case, it may be the A/C high or low pressure switch since you are getting an A/C trouble code.
Is there a fan in the engine compartment?
No, it is in the engine compartment, it is a sensor. A bad fan clutch solenoid is usually the first thing to look for but could be several things.
Where are the electrical connectors in a 379?
LOCATIONS OF MAJOR ELECTRICAL MODULES IN 379E CAB AND SLEEPER TURNSTALK MODULE FIREWALL CONNECTOR – HOOD AND TRAILER HARNESS FIREWALL CONNECTOR – ENGINE AND CHASSIS HARNESS ENGINE HARNESS FIREWALL CONNECTOR ABS HARNESS FIREWALL CONNECTOR LOCATION OF MAJOR COMPONENTS Schematic – 379 Model Family Electrical P94-6023 C 03