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I have a couple of '71 VWs and you can fix almost anything on the with toothpicks and Scotch tape. They just run because they're so simple ... You can actually count the wires in the harness and read the color codes! Thing thing that drives me nuts are the mechanical voltage regulator - they are finicky and today's hardened solid state devices near them in every way.

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Simplicity is huge for reliability… but Volvos from that same early 70s era were also crazy simple yet used solid state boxes to control everything… and were way more reliable than the VWs.

If you don't intend to keep them fully stock there are modern solid-state drop-in replacements for reasonable prices! Given that they are fairly simple cars building one yourself from common electronic parts would not be too difficult either.

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