i've replaced the engine bay wiring in my 1982 928, and now when i go to start the engine there is no spark. there are 12 volts to the positive side of the coil. when i turn the key to start, the engine turns over and the negative side of the coil pulsates as if it is being triggered. a half second later the coil loses spark. i've switched coils and the exact same thing happens. any ideas or advice would be appreciated.

 

did you check the resistors at the fenderwell

 

no i have not. are they ignition resistors? where on the fenderwell are they located?

 

https://rennlist.com/forums/928-foru...or-a-78-a.html

 

did you re-wire the ignition box connection ? there is a "weak" signal for the tach and a "strong" one for the coil ….???? or kept the oem wiring / connection ?

 

i'll double check the connections. the oem wiring harness was so deteriorated that i couldn't tell one wire from another and where they ended!