1989 mk3 supra tail light problem

[Busted Knuckles]

You need a multimeter, and check for resistance between any of the white with black stripe wires (ground circuit) and a know good ground. You should be getting 'infinite' ohms, meaning no resistance. Zero ohms means a break somewhere, and anything else means a corroded ground connection somewhere causing a resistance.

[btwilson86]

Originally Posted by Busted Knuckles

You should be getting 'infinite' ohms, meaning no resistance. Zero ohms means a break somewhere, and anything else means a corroded ground connection somewhere causing a resistance.

Close, you actually have it backwards though. 0 ohms means almost no resistance, meaning a good conductive wire. Infinite ohms (often represented with a "1" at the beginning of the display on a digital multimeter) means that the 2 reference points are not connected to each other electrically

[Busted Knuckles]

Originally Posted by btwilson86

Close, you actually have it backwards though. 0 ohms means almost no resistance, meaning a good conductive wire. Infinite ohms (often represented with a "1" at the beginning of the display on a digital multimeter) means that the 2 reference points are not connected to each other electrically

Your right. It was late at night when I wrote that. Fighting a little insomnia.

Originally Posted by chopsticks

Well i have already opened it and everything looked fine. A buddy of mine told me that is a common problem with the brake lights.

Visual inspection alone may not locate the bad connections. You need to check the connections with a multimeter. Having to shake the box is classic symptoms of a bad connection somewhere.