Re: Slant six ignition help needed


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Posted by D Sherman [72.47.9.228] on Saturday, June 18, 2011 at 01:45:46 :

In Reply to: Slant six ignition help needed posted by Bruce in BC [24.207.112.155] on Saturday, June 18, 2011 at 00:51:32 :

I just had the same problem on our old trolley. Ran when parked (last fall) ran long enough to get it out of the garage and in front of the building, then quit. Pulled out the coil wire from the distributor and saw that there was no spark. Checked the coil (primary and secondary) and ballast resistor with an ohm-meter. I didn't know what the right values should be, but generally these things fail open, and they both had reasonable-looking ohm values -- a few ohms for each section of the 2-part ballast resistor and for the coil primary, and a few K ohms for the coil secondary. Same thing with the pick-up coil in the distributor -- I didn't know the correct value, but it wasn't open or shorted so I figured it was okay. Put the volt meter on the coil primary terminal and measured full battery voltage when the ignition was on and no change while cranking. Checked all the connectors in the system and made sure they were tight. I hate to shotgun things but by process of elimination it seemed like it had to be the electronic ignition module. I believe the slant 6's came from the factory with electronic ignition from 1974 on. A new one was only $18 at our local auto parts and they had one in stock so it was easy enough to just try it. The trolley started right up and ran great, so that must have been it. It's in the body shop now getting repainted, so we won't know for sure if that fixed it until they start using it on tours in July, but it looks like that was it.

So, my suggestion is check the spark coil (primary and secondary), the pickup coil, and both sides of the ballast resistor and if none of them is open or shorted, and all the wiring looks okay, assume they're good and change out the ignition module. Unfortunately there's no easy test for the ignition module itself. The good thing is they're cheap enough that you can just shotgun it.



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