Temp, Oil and Gas Gauges Pegs when HEI hooked up. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-03-2010, 05:48 PM
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Temp, Oil and Gas Gauges Pegs when HEI hooked up.

This has been driving me nuts. 355 SB Chev
Mallory 85 Series HEI Distributor
American Autowire Kit for 49 AD Chev.
Haneline 3/1 gauges.

After may hours I found that I would get a circuit between ground and the fuse panel fuse plug ins, on 6 of the plug ins. In looking at their diagram all of the offending fuse connections were in series and are used to provide 12v when the ignition is turned on. In my case Pink wires. After looking for dead shots I finally found that 12v Pink lead to the HEI Coil as well as the tach wire (white) from the fuse panel (when connected to the HEI COIL) would allow a circuit from the 6 fuse plug ins to ground.

The initial problem was the oil, temp, gas would peg or give false readings.

So what I think is happening is that through the HEI distributor, 12v is feeding to ground and messing up the sending units.
Anyone with a similar problem and solution?
How can I check the Mallory HEI Dist?
STRANGE THING IS THE ENGINE WILL START AND RUN!!!!

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Old 04-09-2010, 11:39 AM
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Never anything similar,

Don't know about checking the distributor.

What's the voltage at the HEI ignition on/ engine off?

Why not just use a different source of 12v for the gauges like piggyback on the radio or cigaret lighter, if not available or not desirable I'd go with a 12v direct feed from the battery with a switch, perhaps not very desirable OR find a different 12v source unrelated to the ignition system.

Pegging out those gauages isn't doing them any good...
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