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mysocal911 mysocal911 is online now
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Join Date: Feb 2014
Location: Lomita, CA
Posts: 2,738
Quote:
Originally Posted by Jeremy911T View Post
Hi Dave, First thank you for responding and helping. I appreciate it. I ran all the tests and this is what I found:

1. The B terminal on the plug measures 12 V with the ignition on. However, when I connect the B terminal on the plug with the B pin on the CDI via an alligator clip, the voltage on the B pin goes to <1 V and the C pin reads < 1 V. If I connect the B pin on the CDI directly to the battery the C pin reads 12 V. I think this is where the problem may lie. When the CDI unit is plugged into its connector, the voltage drops to <1.
That's the source of your problem. That power source normally comes from your ignition switch.

Quote:
Originally Posted by Jeremy911T View Post
2. When I check the continuity between the C terminal on the plug to it's connection to the distributor, it reads <1 ohm. Looks like the C wire to the distributor is ok??
That's good.

Quote:
Originally Posted by Jeremy911T View Post
3. When I measure terminal C to ground on the CDI case, it measure 1-10 ohms depending where I ground on the case.
Actually, that measurement should be between the B pin and the C pin with the CDI disconnected.

Quote:
Originally Posted by Jeremy911T View Post
4. I also checked the continuity of the coil and everything is within spec.
So it looks like you've had an intermittent/poor power source to your CDI pin B.
Before troubleshooting the power problem, use a jumper wire to power the B pin by
connecting the wire to one of the fuses on the left side near the big engine harness
connector. Hopefully, your engine should start.
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Dave
Old 02-27-2022, 05:31 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)