1975 Standard main power and key switch feed circuit is a little different than other years.
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From the alternator power has two paths into the passenger compartment because the key switch feed (wire J1) has been spliced into R6 on the engine side of the firewall.
Otherwise its pretty similar to preceeding years. It may or may not have originally been equiped with the seat belt interlock depending on when it was built.
Ammeter indicates current flowing through it to or from the battery. Battery should only supply power during starting, then gets recharged.
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