Would someone please post an electrical schematic for a D4C Series III SN 6YL2167? I have no power at the hour meter. I've had trouble with corroded wiring connectors on the alternator side, so I have a feeling that is also my trouble here. I need to rewire my backup alarm and lights as well.
Here's what I see on SIS:
Thank you for that information. I see the problem already...same plug where the alternator wire was corroded.
Nope that wasn't it. I have no power coming from the alternator on the green 403 wire that goes to the hour meter. I did unplug the harness from the alternator and jumped power to the green wire and the hour meter does work, but if I plug it into the alternator I get no power on the green wire. I have battery power on the purple wire there and then I get voltage on the yellow wire when I crank it but none on the green wire. The yellow wire goes to the charging light which was burnt out but I replaced it and it works now. I just replaced that alternator with a Cat reman last Saturday. Hour meter wasn't working before that either. There's a connector that the yellow wire runs through...I have power on both sides of it with a digital volt meter, but not with a test light. However, I think that's because I'm providing a ground to the lamp when I use the test light which energizes the lamp circuit. I think that yellow wire is a neutral from the alternator except when running which energizes it and makes the lamp go out. So I don't think a test light will tell me anything since it acts both ways. I have checked output on the green wire with the engine running with both the DVM and the test light and get nothing.
Is it charging OK? What voltage are you getting at the B+ terminal when running? You may need to excite the alternator.
I'm getting 13.8-14.5v at the alternator wire and at the battery.
You probably have a broken prong on one of harness connectors I have had this problem several times.