Need help wiring alternator - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 3 Old 08-07-2006, 10:31 AM Thread Starter
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Need help wiring alternator

Hoping this is the best forum for this...

I am trying to wire up a Lincoln Mk VIII alternator, without blowing something up. The engine is being controlled by an SDS aftermarket EFI system, but WMS (the SDS mfgr/distributor) says that the SDS does not control the alternator. That's fine, since I am using an aftermarket wiring harness (Summit's 18-ckt) for the rest of the electricals.

The question is which wires go to what? The new wiring harness has a red wire (ALT PWR) and a white wire (ALT EXCITOR). The alternator has a Y/W (yellow/white, circuit #36) wire which from the car's wiring diagram goes to the the cathode of the coil. There is also a LG/R (light-green/red, circuit #904) wire that goes to the outside of the regulator (from what I see on the diagram). Does this go to the excitor? See this diagram...




On the wiring diagram, wire #36 (the Y/W wire) traces to the fuse box, so it's safe to say that it goes to +12V switched. Wire #904 (the LG/R wire) traces to the instrument cluster, so I assume it goes to the ALT light on the dash. From what I know about alternators, after the ALT light, the other side should also go to +12V ... is this correct? I don't have a Lincoln instrument cluster to check this.

According to Summit's un-reliable tech support, the excitor wire is for the ECU to control the alternator, but then contradicted this by saying their excitor wire just provides a +12V signal.

Anyone know for sure which wire goes where? Does the white excitor wire connect to terminal 904? Also, where would I put an ALT indicator, since the new wiring harness does not have a wire in the dash for this -- should I wire it in series with the Y/W wire or the LG/R wire?

Thanks,
-Neil.


- Shelby Cobra kitcar, 5.0 supercharged.
- Fox coupe with 4.6 DOHC project in progress.


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post #2 of 3 Old 08-09-2006, 11:49 PM
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I assume this is a 3G alt. The yellow goes to Battery power, the green to keyed. The green also is where you would have an ALT light, or put a 500 ohm resistor to spare the alt full voltages.



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post #3 of 3 Old 09-04-2006, 09:34 AM Thread Starter
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I haven't wired it up yet, but that seems to be correct (from other research I did). The Summit wiring kit does not have provision for an ALT light, but I will wire one up in series. Thanks Terry.

Cheers,
-Neil.

- Shelby Cobra kitcar, 5.0 supercharged.
- Fox coupe with 4.6 DOHC project in progress.


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