Hopefully someone can explain how this relay works?
Not an A-body, it is my 02 Silverado. Truck cranks but will not start. Truck has a 4 pin relay that powers up several fuses which in turn run to the PCM and FCIM. Relay has me baffled. One pin is being fed from the ign c fuse, which is constant hot. Another pin runs to several fuses which in turn run to the PCM etc. This is the load side. One pin runs to an engine ground, which is obviously the ground. Which leaves one pin as the trigger, correct? Not according to the schematics I have as the fourth pin is also going to a constant hot. This relay has 2 constant hots, a ground and the load. Perhaps I am overlooking the obvious? Hopefully the attached images are readable. The relay is on 03
Not an A-body, it is my 02 Silverado. Truck cranks but will not start. Truck has a 4 pin relay that powers up several fuses which in turn run to the PCM and FCIM. Relay has me baffled. One pin is being fed from the ign c fuse, which is constant hot. Another pin runs to several fuses which in turn run to the PCM etc. This is the load side. One pin runs to an engine ground, which is obviously the ground. Which leaves one pin as the trigger, correct? Not according to the schematics I have as the fourth pin is also going to a constant hot. This relay has 2 constant hots, a ground and the load. Perhaps I am overlooking the obvious? Hopefully the attached images are readable. The relay is on 03
