engine is a blown 355 merc dist, thunderbolt 4 ign, engine cranks but no spark, if i tap the wht grn to ground it will fire the coil, tried 2 diff dist same problem no spark, i hooked up my spare dist to the wiring and spun the dist over with a drill no fire or tach sig at dash,tach stays at 0

any ideas

thanks

Did you try replacing the coil ? Kill switch lanyard ? (sometimes they get bumped, and then the motor wont fire).

swapped coils first and kill switches in place, plus if i manualy ground the coil it will fire

need to know how to test the tb4 system

did you have the distributor grounded?and have you tried the dist module?

Send me your email address in a pm. Monday evening I'll send you two pdf's, one a flow chart for troubleshooting, and the other with detailed troubleshooting procedure.

i just got it running clead off the corrosion on the rotor where it hooks to dist shaft and now it fired right up

thanks