What volts should the coil read during cranking?

1973 DODGE TRUCK
Avatar
BSAM450
  • MEMBER
  • 2 POSTS
When I turn the key on the test light on the positive side of the coil lights up. When I crank the engine over the light goes off. It seems to me when I let off the key it will then fire. Can you help me in the right direction.
Feb 25, 2012 at 5:32 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
replace the ballast resistor on the firewall. that sounds like your problem.
Feb 25, 2012 at 6:34 PM
Advertisement
Avatar
BSAM450
  • MEMBER
  • 2 POSTS
Well I forgot to mention that I did replace the resitor on the wall and also the module box. It wouldn't even fire before that.
Feb 25, 2012 at 7:07 PM
Avatar
HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
check gap of pickup coil in dist .008-.010" resistance of pu coil should be 400-800 ohms
Feb 25, 2012 at 7:16 PM