Haltech S4 alternator back plug with haltech swap?

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May 22, 2006 | 04:55 PM

hugo20

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From: Sherbrooke,QC,Canada

S4 alternator back plug with haltech swap?

The wire going from the back of the ALT to the ECU is gone with my old harness.
Is the backplug&WIRE needed for the alternator to work and charge the battery?

If it is needed, how do I wire it?

May 22, 2006 | 05:06 PM

RE TurboII

Meow

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From: San Diego

isn't that plug hooked up to the lower engine harness (starter and battery harness). im not sure but i dont think its on the ECU engine harness. maybe someone will clarify it

May 23, 2006 | 05:46 AM

hugo20

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From: Sherbrooke,QC,Canada

humm, yeah, but i think it was on the ecu harness.

May 23, 2006 | 02:29 PM

-=Lil Red=-

R.I.P. Guitarjunkie28

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From: 626 So Cal

t2 harness it is on the battery harness.

NA harness its on the ecu harness.

May 23, 2006 | 04:12 PM

hugo20

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From: Sherbrooke,QC,Canada

hummmm k your right. The problem is that my car was a S4 N/A.
What is the real use of the alternator back switch? Is it used to regulate or to turn ON the alternator or its only for the idiot light?