BigArt
In for the long haul
Here's the deal and before anyone says check the grounds, I've done that. All checked and cleaned. The problem I'm having seems to come from only one circuit. That is the Orange circuit coming off the ignition switch. It feeds/controls CRUISE, 4WD, BRAKE, and HEATER A/C. All other circuits work fine, and the truck runs fine. Heater control is flaky. During the summer, I had to run a separate fused line to the heater control in order to have an adjustment for the blower motor. But the vent doors are still sluggish, and I'm not sure that the temperature control works. 4WD does not work at all. Have actually changed the 4WD actuator. CRUISE seems to work most of the time. Sometimes not. The ABS hasn't worked for many years. The ABS light is always on. Some testing results and always testing the Orange wire from the ignition switch, or at the fuse box (same results):
With all fuses in: Reading 8 volts.
With all fuses removed: Reading 14 volts.
With only Cruise fuse in : 14 volts.
With only 4WD fuse in: 14 volts, UNTIL I engage 4WD, then zero volts.
With only Heater fuse in: 8 volts.
With only Brake fuse in: 11 volts.
I initially thought it might be a faulty ignition switch, but I'm not sure now. It may be, but why the good reading, until I plug in the heater or brake fuse, and why zero volts when 4WD engaged? Any other thoughts, suggestions? I have detailed wiring diagrams, will post the offending circuit for your reference. Thanks.
With all fuses in: Reading 8 volts.
With all fuses removed: Reading 14 volts.
With only Cruise fuse in : 14 volts.
With only 4WD fuse in: 14 volts, UNTIL I engage 4WD, then zero volts.
With only Heater fuse in: 8 volts.
With only Brake fuse in: 11 volts.
I initially thought it might be a faulty ignition switch, but I'm not sure now. It may be, but why the good reading, until I plug in the heater or brake fuse, and why zero volts when 4WD engaged? Any other thoughts, suggestions? I have detailed wiring diagrams, will post the offending circuit for your reference. Thanks.
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