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Old 12-27-2011, 12:52 PM
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My alternator is magnetic?!?

Just swapped old 350 motor for new one in '50 Ford truck. Now some gauges don't work properly. Temp gauge pegs to right and gas gauge to left when ignition on...also block & alternator become magnetic. Both the frame and chassis are grounded to the negative battery post, and the block is grounded to the frame with battery gauge cable. Any suggestions are encouraged. Thx.

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Old 12-27-2011, 01:02 PM
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The alternator will be magnetic with the engine running.

Your gauges are made to run on 6 volts not 12, you need to wire them through a drop resister
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Old 12-27-2011, 01:17 PM
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Your gauges are also positive ground..
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Old 12-27-2011, 01:18 PM
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Thx for reply. They are 12 volt gauges.
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Old 12-27-2011, 02:19 PM
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Add another ground strap from an intake bolt to the firewall.Try swapping the terminals on the gauges and see if that helps,sometimes to get a good ground for the gauges you may have to make the metal underneath the ground wire bare and use a star washer.Had the same problem with a gas gauge and added an additional ground wire to the sender and it fixed it.
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Old 12-27-2011, 09:05 PM
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gauges pegging, sounds like a bad sending unit (or grounding out)
did you swap out the sending units from the old engine?
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Old 12-28-2011, 09:43 AM
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What gauge are in the truck,stock fords had some kind of voltage limiter to limit voltage to the gauges.
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