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I'm trying to register a '89 900 5 door and the rear lights turn on but dim when I press the brake in and lights up brighter when I have the light switch on. Could anyone suggest a solution?
 

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I know this car.

the problem, incase you don't quite understand is that when the car has its driving lights on the two outer brake lights are on brake (as in the dual element globes) then when the brake is applied the smaller element lights up as well as the larger one.

so the dual elements are reversed!

I thought you might be able to turn the bulbs arounds but they only go in one way, and we have also checked the earths.

all other lights on the rear work fine including the high brake light and both driving lights on the hatch.
 

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I'm trying to register a '89 900 5 door and the rear lights turn on but dim when I press the brake in and lights up brighter when I have the light switch on. Could anyone suggest a solution?
You have a faulty ground connection on the rear hatch.
 

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wrong rating dual filament globes or reverse the 12v feed going to the tail/brake filaments in the globes
 
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