View single post by DonBurns
 Posted: 01-29-2019 12:15 am
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DonBurns

 

Joined: 09-18-2015
Location: Fullerton, California USA
Posts: 147
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 I've been pulling what's left of my hair out, and I am hoping someone can help me with some trouble shooting. I had finally gotten 15800 running pretty well. It seems most of my issues were due to the connections to the distributor cap. The leads were secure but the metal connectors had been pulled into the rubber, so the spark had to make a jump. So that fixed I moved to another issue, which was that after my conversion to RVC the tach isn't working and the speedo was never right so I decided to replace both - and maybe get the originals working later. Went with a GPS speedo from SpeedHut and a basic tach. Anyway, got them installed and now the car won't run. Seems like it wants to fire when the starter motor is turning, but then stops when I release the key to the run position. Replacing gauges should have nothing to do with anything, so I assumed I bumped a connection somewhere under the dash. Spent many hours tracing the circuits through to the engine compartment.

One suspicious thing that was going on before this was that when I turned the key to "start" there was usually a delay before the starter kicked in. Always started though, so maybe related? The switch seems to be OK. If I use my meter I get instant continuity from the brown wire to the ACC, run and start wires as appropriate.

When I use my meter to check voltage to the coil, I get 10+V in the "start" position, but only 0.7 volts when in the "run" position. That's the + side of the coil which has the wire from the starter solenoid. On the negative side is about 0.3 V, I assume due to the 3 ohm built in resistor. I am assuming this is the issue, since I should see 12+V at the coil?

Just to make sure I didn't mis-wire when I connected the new tach - There are two wires from the Pertronics, red to + side of coil, black to - side of coil. WY wire from engine harness pin 2 and wire from starter motor to + side of coil. Wire to new SpeedHut tach to - side of coil.

Does it sound like the fault is in the starter motor, not supplying 12V to coil? I have had many starters go bad over the years, but the problem has always been that it doesn't turn the motor over, not something like this.

Thanks for any suggestions.