Ok Web. I did the measurements as you suggested and it all measured as you indicated.
- Both wires disconnected at the alternator
- pulled both CBs and there was 12.4 v voltage at the 87 terminal on the OV Relay
- field only CB in, 12.4v at 86 and 87
- alt CB only in, 12.4 v at 30 and 87
- both CBS in, 12.4 v at 86, 30 and 87 and nothing at 85.
I have traced every wire from origin to OV Relay to he alternator. From both CBs to the OV Relay. I even disconnected the wire from the alt CB completely (after first checking and there was no voltage at the cb on that wire with it pulled, so cb working). I did continuity checks on wire only to be sure they are correct as numbered.
I checked all wires correct on the correct terminals of the OV Relay. I don’t know what a “crowbar” is or how it works but it’s there. The wire numbers are slightly incorrect in this picture. Should not be “AB... but just A08.... etc”
So how is terminal 87 getting power even with alt cb pulled? It always gets volts from somewhere regardless of cbs.
HEY..... I then disconnected all the wires from the OV Relay except the 87 wire going to the alt. It still showed 12.4 v even if the master was off and no wire connected! Then I realized the alt noise filter was between that wire and the actual alternator. It must have been holding voltage (like freq flyer stated) because I took it out of line and with it disconnected, all wire then tested out correctly. I will then assume it’s bad or doing strange stuff? The alt wire came in and out on the + terminal (per schematic) and the - terminal was grounded.
So so I guess I’ll get another one and try it out?
You're going to have to get access to the OV module and check each terminal. It appears to be a standard 'fog light' relay so the terminals are numbered on the plastic right next to the metal blade.
Leave the 'IGN' and 'B' wires disconnected from the alternator for this check. Pop both breakers and check all terminals for no voltage. Press in the field breaker and check that there is voltage on relay terminal 86, ONLY. Pop the field breaker and press in the alternator output breaker. Then check for voltage at relay terminal 30, only. Finally press in both breakers and check for voltage on relay terminals 86, 30, and 87, only. If you have any readings other than this, check for a proper ground on relay terminal 85.
For these checks, 'voltage' = battery voltage and the relay should remain plugged in.
Web