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Yeah, the 90 amp is actually less than the 120 but why the 75 is $50+ more is weird. All Denso, all the same alt except for the amperage. I got the 90. Should be here tomorrow. Even if the new alt doesn't solve the problem it will still be worth getting it off my list. Thinking maybe one more thing before replacing the PCM...remaking a wire harness for the regulator including new plug, wires, and connectors. Costs next to nothing and not much time.
HY, when I installed the external voltage regulator a few years back I cut the field service wires going from the PCM to the alternator. From there, I pulled this gizmo (photos) off the alternator (had to cut the ground cable too) and never put it back. Seemed pretty obvious to me this gizmo served no purpose other than organizing the wires and making it look pretty. I cannot imagine it serves any other functional purpose. Just checking, but am I wrong?
Actually that ring terminal that comes directly out the gizmo that I called a ground mount is not a ground. I think it's just a mount so the gizmo stays on the alternator. Let's put it this way...there is no conductivity between the two ring terminals I label as "Ground mounts to alternator". The only ground conductivity is between where I cut the ground cable and the ring terminal at the end of the ground cable on the other side of the gizmo.
I always though that was a ground... if not for the alternator/field windings, maybe for the PCM itself.... So far as I know, there is nothing inside that plastic block, aside from the wires.... an 'organizational tool', and that's it. Never tore one apart to look though.
I always though that was a ground... if not for the alternator/field windings, maybe for the PCM itself.... So far as I know, there is nothing inside that plastic block, aside from the wires.... an 'organizational tool', and that's it. Never tore one apart to look though.
That ground cable I cut that goes thru the gizmo with the ring terminal at the other end is what grounded the alternator from one of the ground studs to the engine ground stud. That other ring terminal appears to have no purpose other than securing the gizmo to the other alternator ground stud. Like I say, no conductivity between those two large ring terminals. Not sure how the PCM is grounded.
But, you bring up a good question. How is that PCM grounded? I'd really like to know. Now, there are 5 million wires that go into that PCM connector/plug. Are any of those grounds? I have no idea. I see no other wires coming out of that PCM other than what goes thru that wire harness/connector/plug. Could it be possible the mount screws are the ground? I looked. Hard to believe. Those mounts are nothing more than plastic ears that stick out the side of the PCM case (three of them). Interestingly, all three of those mount screws were loose. Two slightly, the third the screw stuck out a 1/2". I could rock that PCM a little. Vibration did all that. Geez! I cinched them up but I can tell those sheet metal screws don't want to get very tight. It doesn't rock anymore...for now.
I'm not buying another PCM. At least not at this point. But I'm wondering if anyone has seen this before. The part number for my PCM is 56027848. The PCM in this link is also called a 56027848 in the description. However, the sticker on the side (if you zoom in the picture) says R6027848. It also has a Mopar logo on it. I'm guessing the 'R' in R6027848 means REBUILD?? Also, any idea why the Mopar logo is on the sticker? Does Mopar do PCM rebuilds?
Thinking maybe one more thing before replacing the PCM...remaking a wire harness for the regulator including new plug, wires, and connectors. Costs next to nothing and not much time.
