Thread: 350 will not rev when hot

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If the voltmeter is jumping around when the problem occurs, it definitely sounds like a basic electrical problem. One simple test you can try is just run a jumper wire from the charging terminal on the back of the alternator directly to the positive side of the coil, or to the distributor if the coil is in the cap. Run another jumper wire from the alternator housing to the distributer housing. If that makes it run better, that will narrow the problem down to a bad wiring connection. While you are running it that way you can also use a volt meter to confirm the alternator output voltage.

Originally Posted by Driver50x

If the voltmeter is jumping around when the problem occurs, it definitely sounds like a basic electrical problem. One simple test you can try is just run a jumper wire from the charging terminal on the back of the alternator directly to the positive side of the coil, or to the distributor if the coil is in the cap. Run another jumper wire from the alternator housing to the distributer housing. If that makes it run better, that will narrow the problem down to a bad wiring connection. While you are running it that way you can also use a volt meter to confirm the alternator output voltage.

7.9 v at the coil when its doing it will let it cool then try what you said with the jumpers. Will it work to go from the battery instead of alternator? Very hard to get to the alternator where its at. I did check 14v at the battery always.