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6 Volt Alternator replacement for 356/912 engines.

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  • 6 Volt Alternator replacement for 356/912 engines.

    Tom Olson, long time PCA member and annual cross country 356 driver bought a new Tudor 6v alternator for his 356B. We installed it this weekend. Called Cliff Murray in Philly who found them and talked to him about the wiring confirmation. It was an easy conversion. 7.5-7.8v at idle and 29 AMPs. Everything fit as well as expected. No issues at all.
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    We removed the old generator, then measured the new as compared to the old one. Good match all around. It’s a “one wire alternator” just like you put on your 1950’s hot rod. It has a single post for output wire to the battery and a small red one that goes to the blue wire to the Generator light. You can use your original wire harness, alternator B+ to BATT on the regulator, black field wire from the alternator red to the blue wire removed from regulator B+. But both must be isolated from the regulator, we bolted them together, covered with heat shrink, zip tied to harness. We left the regulator in place and removed the original harness, Tom carries a spare generator under the floorboard on his annual cross country drives. Generator can be reinstalled in a couple hours.

    Everything went well, good power, generator light operates normally,(may not work with LED’s). After the testing we built a harness.
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    After re-testing, we built up a new wire harness, finished the install. Not too hard overall. We swapped the FAN and pulley bushings, using the original sequence of spacers. The fan was about .060-070 deeper into the Shroud but no rubbing or interference. Quiet as before.
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    Final install, new harness, 3 wires, B+ to battery lug on voltage regulator. Ground on alternator case to regulator ground tab, just like the generator, small red wire to blue wire to generator light, Isolated, insulated. Not too hard. ​Thanks to Cliff Murray in Philly for taking the call, and for the text on the wires. The generator had no instructions or paperwork inside. Tom ordered it from the UK, it arrived in 4 days. This is for the small diameter generator replacement, but twice the original power out, pretty simple. Inside was mostly empty space, the actual alternator was surprisingly small for the power out.
    Attached Files
    Pushed around since 1966.

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    More photos of the install
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    Attached Files
    Pushed around since 1966.

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