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1973 337G…. Has had 3 separate over voltage issues.
See my detailed post on circuit breaker panel.
The second was a landing gear related.
The third was replacing these 2 diodes on front firewall. One had a physical break on the post. Once this was fixed…, I’m 99.9% over-voltage free.
I had the same symptoms as you. No problem running only on rear. Running on just front or both alternators, problem present.
The diode for the front had the broken post.
Hopefully the photo attaches to this post.
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