GM Coil and Module Help Required

yeah check your coil, 4 connectors, identify the two pairs, one pair is + and one is -

coil + has 12 volt switched to it
run wire from the other of the pair to B on module
negative on coil to tacho and to diode and to C on module
W and G go to pickup and you will need to work out which way


you might have to look up orginal application of coil to find which pair is which.


or you have the pickup wires backwards, depends on the car the module was made for.
with them back to front you get, running rough with the igntion timeing wildly adjusted away from where it previously ran fine. Or not running at all.


see my post here, bit of a rant, but it has the part number for a diode you can use to protect your module and some links to help you decide that you have indeed made a good choice for your igntion set-up, and a link to show diode use on a jaguar GM module set up .
The module takes a "belt" of back EMF from the coil and the alternator if you stall the car when the alternator is FULL ON. think reversing up a steep drive on a cold morning
revs up in the 1500+, battery is flat-ish, alternator full on, you drive and you stall ,
altenator abruptly loses field power and spikes the eletcric system, taking out your module or damaging it so that it fails later at a very inoportune moment. that spike was fine on a car with little or no micro processors. you now have a simple one so some protection makes sense.
If jaguar peristed with this diode set up when using delco modules even when GM stopped i think its a good idea

post here
New release Distributor for Slant 6


Dave