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porsche4me's Avatar
Join Date: Jul 2002
Location: Savannah
Posts: 151
Alternator wiring for a race car question

Hello - I have a car with NO wire in it - The Alternator has 4 wires - One large Red going to the Starter - 3 smaller ( white, Brown, Green ) in one plug that would have gone to the relay/fuse board in the engine compartment behind the driver ( mine is gone)

Where do these wires GO ???? I need to figure this out soon -- The car has to have a master Kill switch on the dash - should the larger Red wire from the alternator run straight to kill switch.

The kill switch has a #2 cable to the battery ---- and a 12 foot #2 from the kill to the starter.

Also one more question - With the alt in the car can I tell if it has an internal or needs an external regulator ???? it is a 1973 2.0 liter .... thanks
1977 911S Coupe
Stolen - car chase - in the river - pulled out - sold to me!!!!!
"Life is running hurdles in the dark"
Old 01-20-2011, 06:48 AM
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ASE Master Tech - 35 yrs
larrym's Avatar
Join Date: May 2001
Location: Sierra foothills, CA-usa
Posts: 1,030
oem alternators all had external regulator - vw bus IR alternators have been fitted by some guys

red wire is your battery wire, joined at the starter - wire your battery cable thru the kill switch, and that will solve that issue

the 3-prong plug will simply plug directly into a stock regulator - no need for the relay plate

If it works, take it apart and find out Why.
Old 02-26-2011, 09:59 AM
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John Rogers's Avatar
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,206
I would suggest checking with the organization you will be racing with about the location of where the kill switch has to go? Most groups want it to be readily accessible from outside the car with that triangular sticker that tells the fire/crash crew where to kill the power if you are upside down! As for the switch, buy the Bosch if they are still made or one with the large ceramic resistor which is used to kill off the power from the alternator, otherwise it will probably burn up since the switch is not like the ignition switch.
Old 02-28-2011, 08:17 AM
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