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Brake lights/turn signals/DB10 Relay issues

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TimK

TimK

Jedi Knight
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1960 BN7
My brake lights and turn signals have failed. Cause may have been turning on wipers for first time in 20 years. They went very slowly halfway across the windshield and stopped. I managed to get them back to park but heard a loud buzzing of a relay. At some point the 3-4 fuse blew and the rear bulbs blew. After replacing the fuse and the rear bulbs, the turnsignals worked for a brief while (I didn't check the brake lights. Then the turnsignals and brake lamps failed. The same relay buzzing sound now occurs sometimes when I turn on the turn signals. After studying the wiring diagram I see a connection between the wipers, brake lights, and turn signals at the 3-4 fuse. I also see the possibility of problem with the DB10 Relay box. Is there a way of trouble shooting the relay box? Moss has a $135 electronic replacement, but I'd hate to buy it and ruin it while trying to get the wipers to work again.
 
I did a search and found some info on setting the air gaps on the relay. I'll try taking my relay off and seeing what I can see. But one more question: Where is the brake light switch itself? It is listed on the wiring diagram, but not shown in the manual under electric nor under the brake system.
 
Hi Tim,
The brake light switch is on the right side (as you drive the car) in the engine compartment. It is connected to a brass fitting where all your brake lines branch out to the wheels. Here is a photo of the switch in the blue circle. Your connector will probably look a little different and be located closer to the front of the car. This photo is for a car with a brake booster.
 

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Thank you very much Greg
 
The rest of the story is that the problem was the new fuse I put in was not fully seated and not making good contact. I discovered this with a test light. That also explains the intermittant nature of my problem and the buzzing of the relay -- insufficient amp flow.
 
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