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Those didn't get sat upon for 430,000 miles! Unless, like my wife's grandma, the driver only weighed 80 lb.
Most grids I've pulled out are seriously messed up, but they draw a few amps if I remember the meter on my power supply. A 12V supply that delivers 3 amps is a pretty hefty thing itself-- you might want to check that yours still supplies 12V while connected to your heater-under-test. Also, the butt-back combination is wired in series, so it would be really a current hog if you only tested one grid meant to be wired as a pair.
Usually the thermostat is no problem (cold enough) when I'm working on seat heaters, but I've had to test some in the summer: I just threw them in the freezer to chill the clicker first.
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Art Benstein near Baltimore
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