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?