Hey Guys, need some help with the rear defroster on my 90 325i coupe.
The switch works, it has continuity through the correct terminals when depressed.
I measured the resistance to ground, through the defroster grid, it was about 23 ohms. Anyone ever check that on their car? Whats the resistance supposed to be?
If my calculations are correct, with a 12v source, it will only pull about .5A, and its supposed to draw about 25A, no?
I get ~12v at one side of the grid, and ground at the other.
There doesn't appear to be any break in the lines.
Why doesnt it work? lol
The switch works, it has continuity through the correct terminals when depressed.
I measured the resistance to ground, through the defroster grid, it was about 23 ohms. Anyone ever check that on their car? Whats the resistance supposed to be?
If my calculations are correct, with a 12v source, it will only pull about .5A, and its supposed to draw about 25A, no?
I get ~12v at one side of the grid, and ground at the other.
There doesn't appear to be any break in the lines.
Why doesnt it work? lol
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