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Old 12-31-2000, 07:46 PM
barrie barrie is offline
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Join Date: Jan 2000
Location: buckhorn, ontario, Canada
Posts: 101
A more definitive test is to measure the "current draw". Since a regular-duty engine block heater is typically rated around 550 watts, you should read between 4-5 amps. Between 3-4 amps you have either excessive resistance or a lighter-duty heater. If you read less than 3 amps your heater isn't doing much and should be replaced.

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