resistance of the deffoger relay grid?

Aug 21, 2003 2 Replies
A

As mentioned before, I'm fixing the rear defogger and I would like to know if somebody know whats the average resistance you can measure from end to end of the defogger grid. I measured mine and it was about 600 omhs, I wonder if this is ok, or I should just forget about this thing.



thanks Ant


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O

Without guesswork

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that T1 heated rear window takes 60-70 Watts of electrical power.That means in 12 Volt system resistance of about 2.4 ohms - 2.0 ohms.I think 600 ohms you measure means that there are bad connectionssomewhere. I don't think that some cut wires in the heater wouldraise the resistance to 600 ohms.

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S

Just guessing, but it ought to be around 10 Ohms (maybe less).

600 Ohms will produce only 1/4 Watt, which wouldn't warm a fly's rear end. Your grid is knackered.

Speedy Jim

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