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September 29th, 2008

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Q & A: Alternator Wiring

Friday March 13th, 2009
Q & A, MGA, MGB, MGC, MG T-Type, Midget
I'm in the process of changing out a Lucas ACR 16 34 Amp Alternator for a
Delco CS130 96 Amp Alternator.
My Lucas has 3 wires coming out. From what I can tell from colors, 2 are
heavy gage Brown w/Black and 1 thin Yellow w.Black. Obviously the colors
are really worn and hard to distinguish color wise.
My new Delco has wiring instructions that say Large & Small Solid Brown
along with Large Red from Alternator to the battery post on the
alternator. The Small Brown on the new plug to the Brown w/Yellow tracer
from the wire harness.
I've been on the web trying to find wiring diagrams for both alternators
with absolutely no luck. I've also tried several wiring combinations and
all I have succeeded in doing was the lock the starter up.
Any info will be much appreciated.
The BROWN wires are always hot and are connected directly to the
starter solenoid. The BROWN/YELLOW is the indicator light. That's about as
much as I can tell you. You can call, and that might be helpful if you
haven't al... read more