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Old 05-01-2005, 01:03 PM
P.E.Haiges P.E.Haiges is offline
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Join Date: Jan 2000
Location: PA
Posts: 5,440
Brian,

You are correct that a GP that increased its resistance would draw less current and would not get as hot.

However, I have never seen a GP that changed much in resistance before they burned out completely. And remember you are measuring cold resistance which is not always a good indicator of the hot resistance which can only be measured by measuring the hot current and the voltage applied.

The best GP test is to connect them directly to a good 12v car battery and observe how hot they get. If they don't glow a bright orange, they should probably be replaced. I would do the visual hot test on any GP that measured over 1 ohm cold.

P E H
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