I am having a voltage regulator problem (flashing lights). Heres my situation, I have replaced the alternator and bought two new regulators to replace the old regulator which I believe was causing the battery to overcharge. Just on a hunch I completely unhooked the wire to the new regulator (essentially an open circuit) and did a voltage test. I then hooked up the new regulators and performed the same test. They put out the same exact voltage reading. I wonder how this is possible when the old regulator is causing the battery to overcharge? Because of this, I don't think it is a connectivity issue between the regulator and the battery.
I have a theory that the PCM has been replaced by a previous owner because the wiring does not look factory. My big question is:
Is it possible that the PCM that is currently in the truck can not communicate with the new regulators I bought for my 91.5 year model truck? In other words, if there is a PCM from a certain year model truck (say a 89-90 or 92-93) and I had a regulator for a 91.5 truck, would the PCM not be able to communicate properly with the new regulators I have now?
This is the only possibility I can think of. I am truly sorry for the book. I just wanted to make sure I provided adequate information.
Thanks,
Chris