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740 - No Brake Lights

I'm working on a friends '91 740 wagon. He's got no brake lights. All 3 are out, every other light works, and the "bulb out" light on the dash is not on. The fuse is good, there is power to the brake light switch under the dash, and power through it when the pedal is depressed, but there is no power at the back of the car in the wire for the brake lights.

The fuse location tag indicates that the #4 fuse is for the brake light, and "shift lock". Should we be checking for a shift lock switch? I don't see how the two are related, but if somebody says they are I'll take your word for it.

Short of tearing the entire car apart to follow one wire, is there anything I should check? Any thoughts appreciated.






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