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EFV-8 Club Forum / General Ford Discussion / '36 Ford light switch

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rogbell

01-24-2016 @ 11:51 AM

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In reference to my previous post regarding a wiring problem I've double checked the routing and connections for the wiring on my '36 but the problem with the taillight and brake light still exists. I've pulled off the light switch to see if the contact plate was not aligned properly but cannot see how it could be. Isn't there only one way that the bakelite contact plate can be placed into the lower cup of the switch? Is it possible that the rotating contact assembly could be bad? If I'm missing something please
let me know.

01-24-2016 @ 12:18 PM

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rogbell > are the wiring connections at the 'contact plate' soldered or are they just slipped on? I suspect a wiring error at the contact plate. Verify the correct color coded wires are connected to the correct contacts on the plate....

rogbell

01-24-2016 @ 1:07 PM

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The connections are not soldered, they are slip on connections.. According to the drawing that came with the wiring harness the wires are connected correctly. There was a suggestion that I should switch the taillight and brake light wiring. It would be easy to do with the slip on connectors if this would work.

TomO

01-24-2016 @ 1:19 PM

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You could do a continuity check using the diagram from Vanpelts sales.

http://vanpeltsales.com/FH_web/FH_images/FH_electrical-pics/Flathead_Electrical_wiring1936.jpg

With the lights off, there should be continuity between the yellow with red tracer wire and the green wire. There should not be continuity between any other wires.

Tom

rogbell

01-24-2016 @ 4:23 PM

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Tom

I'm not sure what you mean with the lights off? I don't know where to check the continuity other than as follows.
Did you mean to check on the bakelite contact plate? If so, this is what I did. I disconnected the battery, removed the contact plate from the housing and checked for continuity between the yellow with red tracer and green wire. There was continuity, but, there was also continuity between the yellow/red and all other wires attached to the plate. Also between the green and all other wires on the plate. Not sure if this is a problem and if so, how to correct.

Roger

TomO

01-25-2016 @ 7:58 AM

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Roger,

What tool are you using for your continuity check?

With the plate out of the car, you should not have continuity between the yellow with red tracer and any other wire except the green wire.

The switch is used to make contact with all other lighting wire. Look at the wiring diagram and you should see what I mean, if not come back and ask questions.

Tom

rogbell

01-25-2016 @ 9:03 AM

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Tom,

I'm using a multimeter. I've tried a different multimeter just in case the first one was defective and got the same results, continuity between yellow/red and green as well as between all the other wires. Doesn't make sense as the bakelite plate insulates against current flow. A faulty wire harness? I hope not as I don't want to re-wire again.

Roger

TomO

01-26-2016 @ 7:01 AM

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Try using a test light. Some multi-meters will give false readings by reading through the bulb filaments.

You will need to connect your battery in order to use the test light, so make sure that the contact plate cannot touch the frame or any other grounding source.

Tom

rogbell

01-26-2016 @ 11:09 AM

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Tom,

I used the test light, connected the battery, insulated the contact plate, and had the following results. The light did not come on between red/yellow and green, But it did between red/yellow and all other wires. Should it be this way? Still don't know why the tail light is on when light switch is in off position but no other position. Also, brake light does not work, new brake light switch. Not sure what action closes brake light circuit. Is there something that pushes the piston in the switch?
Thanks,

Roger

trjford8

01-26-2016 @ 5:46 PM

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You should have a hot at the yellow red and the green which goes to the stop lights. the stop lights are "hot" all the time at the stop light switch. If you don't have fire at the green terminal the brake lights will not come on when the pedal pulls the switch. Double check your diagram that came with the harness and make sure it is for the 36 and not a later car. If you have the 32-37 Service Bulletin book there is a 36 diagram in the book. Compare it to the one that came with the harness. From your description it sounds like there may be something wrong with the harness. It would be rare but it could happen.

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