Re: 88 Four Winns/omc 5.7 charging circuit ??
Hi Robert,
Do you still have the copy of the schematic?
If you look at the orange wire coming off the POS connection on the alt, That wire goes indirectly to the battery. By indirectly, I mean that it goes to the "hot" side of the "assist" solenoid, thru a 50A fuse, then to the hot side of the starter solenoid, and then to the battery.
By the way, it doesn't "stay" orange....from the alt it's orange, then at the assist solenoid, it becomes RED/PURPLE to the fuse and after the fuse it's PURPLE/WHITE to the starter solenoid and finally RED to the battery. Your colors may vary depending on whether someone replaced them with the wrong colors or from 87 to 88 they changed (not likely)
That wire from the alt will be at least a #10 wire since were talking 50+A max charging current. (it's marked #10 in my 1987 service manual)
If you put a volt meter on the alt, with the key off you should read battery voltage (if charged , approx 12.5V) If the engine is running fast enough to produce a charge, it should be about 1-2 V higher 13.5-14.5V
If you get ZERO voltage check that 50A fuse and all the connections.
Cheers,
Rick
