coffee break Posted September 9, 2017 Share Posted September 9, 2017 When I got back from https://www.atlantabritishcarfayre.com/ I noticed one of the brake lights was on. This tells me I have at least two problems to solve. 1) Why is the light on 2) Why only one I've got the factory wiring diagram to look at and a Simpson meter to probe with. As to the bulb that wasn't lit, by visual inspection it looks good. The next place I will be looking is the wiring just inside the rear wing, it was damaged and I wrapped some tape around that area. Any suggestions on testing the pressure switch and is it in direct contact with brake fluid? Thanks y'all Carl Link to comment Share on other sites More sharing options...
xcarguy Posted September 10, 2017 Share Posted September 10, 2017 Carl, Can you use a jumper wire (bypass the pressure switch) and see if you have brake lights? This might determine if the switch is/is not the problem. Link to comment Share on other sites More sharing options...
scannon Posted September 10, 2017 Share Posted September 10, 2017 Do both lights come on when you press the brake pedal? One on and one off or one bright and one dim usually means a ground problem. Not sure about your Caterham but all of them I have inspected use a push button switch on the brake linkage under the pedal cover. Link to comment Share on other sites More sharing options...
pksurveyor Posted September 10, 2017 Share Posted September 10, 2017 Go to Autozone. http://www.autozone.com/electrical-and-lighting/stoplight-switch/duralast-stoplight-switch/116467_0_0_98519 Link to comment Share on other sites More sharing options...
James A Posted September 10, 2017 Share Posted September 10, 2017 Paul great find at Auto Zone! And $9.69 to boot. Carl, Swap brake bulbs and see if the one is burned out. Most likely it is what others are saying, the brake light switch need to be replaced or adjusted/tightened, remove the peddle box cover unplug the brake light switch and see if it goes out. Somethings the jam nuts that locate the switch come loose and that is the problem, simply set it and tighten the jam nuts. Link to comment Share on other sites More sharing options...
pksurveyor Posted September 10, 2017 Share Posted September 10, 2017 Ask for stoplight switch for a 1978 Jeep CJ at Autozone. It is a bit long requires a little bending of the terminal. Link to comment Share on other sites More sharing options...
coffee break Posted September 11, 2017 Author Share Posted September 11, 2017 Thanks for the feedback. I'll get to looking and checking after Irma gets out of town. :willy_nilly: Link to comment Share on other sites More sharing options...
coffee break Posted September 21, 2017 Author Share Posted September 21, 2017 Boy was I wrong. :iamwithstupid: The brake lights work fine with the ignition ON, ignition off, no. The light I observed as on was the tail light. I discovered the light switch was in the middle position, ie "running lights". The reason for the single light being on is yet to be determined. The bulb and socket are fine, so some where further up stream the voltage gets lost. Link to comment Share on other sites More sharing options...
coffee break Posted September 22, 2017 Author Share Posted September 22, 2017 I forgot to ask, does the headlight switch light up when the lights are on. Mine does not. Is there a US source for a replacement switch that does light up? Link to comment Share on other sites More sharing options...
WilsonMark Posted October 8, 2017 Share Posted October 8, 2017 You can check here https://www.icrfq.com/products/ for Duralast Stoplight Switch. Maybe you can find here. Link to comment Share on other sites More sharing options...
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