Another Ammeter bypass question:

str12-340 said

Chrysler recognized the issue with the weak connection at the bulkhead when they built fleet vehicles like taxi cabs and police cars and put a grommet in the firewall and routed the main power wires there when they used those "really big" 56 amp alternators .

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I've said pretty much this. In the early 70's my 440-6 RR suffered bulkhead connector damage, I think at the time it had a 45 or 50A alternator, I was an amateur radio operator and did have some gear in the car from time to time. It also "just barely started" to damage the ammeter such as shown on the MAD site.