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What volts should the coil read during cranking?

Tiny
BSAM450
  • MEMBER
  • 1973 DODGE TRUCK
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.
Saturday, February 25th, 2012 AT 5:32 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Replace the ballast resistor on the firewall. That sounds like your problem.
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Saturday, February 25th, 2012 AT 6:34 PM
Tiny
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.
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Saturday, February 25th, 2012 AT 7:07 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check gap of pickup coil in dist.008-.010" resistance of pu coil should be 400-800 ohms
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Saturday, February 25th, 2012 AT 7:16 PM

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