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Please help me with a 1960's GM Delco 10DN Alternator & external regulator.
I need some help on a GM charging system, being used on an old Allis
Chalmers FP40 forklift. The Allis uses an old Delco Remy 10DN alternator, which has an external regulator. The wiring harness and original electro-mechanical regulator were torn out by vandals. The local NAPA store sold me a replacment for the electro-mechanical relay; it uses electronics instead of the old 2 small relays. It looks the same as the old one, and has the familiar 4-conductor plug with it's terminals labeled "F", "2", "3" and "4". The regulator is sold by NAPA as their "MPE VR142SB", and stamped on the regulator case is: "VR103PS" and "12V281 U.S." Here's what I'm pretty sure is usually true on these GM systems, please check me: 1. Wire the Regulator terminal "F" to Alternator terminal "F". 2. Wire the Regulator terminal "3" to the +12V power distribution terminal; "3" is the "Voltage Sense" that controls the amount of voltage the Regulator produces on it's "F" Field terminal. I have some questions about the regulator wiring: 1. I have seen engines where Regulator Terminal #2 was connected to the alternator's "R" terminal, and some where BOTH these terminals were left empty, not wired to anything. What is the difference between connecting those terminals, and leaving them unwired? 2. I am pretty sure that 1 connection to Regulator Terminal #4 was through the "Alternator" panel lamp to the keyswitch's "Ignition" terminal. I believe that there's usually a second wire connecting Regulator Terminal #4 to the keyswitches "Accessory" terminal. I've seen this second wire done two ways: either just a regular wire, or a special "resistance wire" that has about 8 to 12 ohms of resistance. When is it necessary to use resistance wire, versus regular copper? Is the resistance needed only for the old electro-mechanical regulators, or is it still needed on the new electronic regulator? I've always thought it was for current-limiting the Field output of the regulator, but I'm not sure. Thank you VERY much for your time and assistance! I thank you, and my spinal column thanks you (my back *loves* my forklift!) Dave |
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