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******* The instrument lights light because the alternator is drawing current through the coil in the warning light cluster.******
Not to complain, but this is a series four car and the Warning Light unit does not have any wiring going directly to the alternator at all. Series five are different concerning the wiring from alt to warning light cluster. No alt relay in the CPU for series five.
See the series four Turbo and non turbo diagrams I posted in one of my other posts. The warning lights all alight if the alt relay in the CPU pulls in and puts a ground on the warning light clusters light bulbs (all of 'em). Once the alternator starts putting out the Alt relay relaxes and the gnd to the Warning Light assy is there no 'mo and the lights go off in the warning light cluster.
Frankly I still don't see why you don't just run a single wire from the CPU's white/black to the L terminal of the alternator for excitation. Your CPU is still there from what I gather. IF not then you need to look into how to get the turn signals to work without it. One wire from the drivers side of the engine compartment to the alternator. Nobody will notice it. String tie it to the harness going to the CAS etc.
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