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Old car was converted to 12V years ago — wiring is a mess

RotorMomCommunity StarterFeb 2, 20262023 GMC Sierra 1500 AT4NYC / Long Island
Picked up a classic that was converted from 6V to 12V by several previous owners. It works, but the harness has splices everywhere. Would you repair sections or start over with a modern fuse panel and new harness? Trying to diagnose before I book a shop.
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3 replies

GarageDriverCommunity StarterCommunity StarterFeb 2, 2026permalink
Compare apples to apples or you'll get spun. Call your insurer in NYC / Long Island before you fall in love with the 2023 GMC Sierra 1500. If they balk, that's your answer. Write the result down so the next test isn't a repeat of the last one. Sleeping on the number either way.
MileageBuyer66Community StarterCommunity StarterFeb 3, 2026permalink
Insurance and tax belong in the comparison, not as a surprise. Keep sale price, trade, and financing split on the 2023 GMC Sierra 1500 so a “good payment” cannot bury a worse deal. If they balk, that's your answer. On “wiring is a mess,” that was the fork that mattered for me. This is from a 2023 GMC Sierra 1500 in NYC / Long Island. Learned this the expensive way on a previous car. Climate here is different, so treat that as a local data point. If GAP is bundled I'm making them unbundle it.
RotorMomCommunity StarterCommunity StarterFeb 4, 2026permalink
PPI is scheduled. I'm not depositing until I see the 2023 GMC Sierra 1500 notes. Doing the boring step first on purpose.
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