ok im working on a friends rx-2 and its got a WEIRD prob. it only sparks(via timing light) when the key is turned from the start to run...so it only sparks when let off the key to disingage the starter. i would figure its a wiring prob. so we ran a new wire from the plug@ the key to the coils. still no good any ideas? i think we taped into the black with the yellow or white stripe. anybody got a idea..... i pissed with this thing for 5 hours and i got so pissed off i stoped working on it.
David

 

Cranking power to the coils should be yellow and black, ignition power to coils should be just black. YB should go to the + of the leading coil - chuck a test light and and try and crank. I am pretty sure it is not fused. The just black should go through the resistor.

Please note: I reserve all rights to be mistaken, misled or just plain wrong.

 

opps i forgot to say. its not a stock motor or ing. setup. its a later stype(81+)12a with single dist. and its the 81 style elct. ing. there are nor resistors or anything. ill check the wiring thanks buzz

 

That sounds about right. My REPU had that prob after I upgraded to an '81-85 electronic dizzy. Heh, that's kinda funny to think about now (I mess with/fix ignition stuff all the time these days).

 

it should still hold - when checking the colours I used a proper rx2 wiring diag that I happened to have here at work (as you do...) but I used the same schema for my '76 mazda 1300 which now sorta has a rx4 13b bp and 1st gen elec ignition but with external resistors.