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NE SD | On a 2000 model 379, where would a relay for the cruise control be? It has to be under the dash somewhere. This truck is setup so that when the cruise system is turned on, the Jake brake will only work when you jab the brakes. The indicator light shows that the cruise system is on, but it does not work and the Jake brake activates as soon as you let off the throttle. We discovered that the indicator light has its own circuit feeding off the switch so we eliminated the chance of the switch being bad by swapping it out. We also replaced the clutch switch.
Now we are down to this. This is the air brake activated micro switch. It has two wires coming off of it. One of them is presumably a brake light activation wire. Where does the other one go? I can't seem to trace it under the dash after they cross the steering column. There has to be some sort of relay for the cruise system but where?
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2000 Peterbilt 379 cruise control?
