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EFV-8 Club Forum / General Ford Discussion / Instrument light switch

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Discussion Topic: Instrument light switch -- page: 1 2

TomO

08-15-2017 @ 6:42 AM

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Bob, the switch may be OK. You can check it out by connecting your voltmeter on the 2 wires coming out of the switch and turning on the switch. With the switch off, you should read battery voltage (6.2 - 6.5 V) with the switch on, you should read 0.1 or less.

If the switch is the culprit, you can try to repair it by carefully bending the tabs to release the phenolic piece. The switch will probably pop apart, so be careful and hold the phenolic piec in place so you can see how the parts fit.

My guess is that there is a wiper that connects the 2 posts when the switch is pushed in and that you can clean the wiper and the 2 contacts to make the switch work.

If the problem is not in the switch, which is what I think, remove the bulbs that are activate by the switch and using the resistance scale of your meter, connect one lead to a good ground on the back of the dash and the other to the switch lead. If you get a reading, you have a short circuit. Check all of the wires going to the lights and the clock.

Tom

len47merc

08-14-2017 @ 10:11 AM

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Thanks ken - I had it. Just wanting to make sure everyone did - the word 'dimmer' was coming up so much I was beginning to wonder whether my (and possibly others') assumptions about the dash switch versus a 'dimmer' switch were correct.

Thanks again -

Steve

ken ct.

08-14-2017 @ 10:04 AM

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Again Steve this is NOT a dimmer switch ,either on or off. He also has a short some where in the lighting system , switch should NOT get hot. Find the short first. 35-39 all used this switch,knobs and sw.pos. are diff. on is either in or out depending what yr. ken ct.

Bob56

08-14-2017 @ 9:44 AM

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Here is one on the dash. Upper left of the radio

Bob56

08-14-2017 @ 9:43 AM

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Here is a photo from under the dash

len47merc

08-14-2017 @ 8:20 AM

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Bob56 - so that no one gets confused, please clarify whether you are referring to the 'on/off' switch on the floor that looks and functions like a classic dimmer switch, or to an actual dimmer switch itself that someone before you may have installed. Thanks - this has kind of gone around the horn a bit.

I looked on ebay today just to see and thought I saw a couple of these listed, but I am not nearly as conversant and knowledgeable on this model and year as you and ken. Have a look - perhaps what you are looking for is there.

Steve

Bob56

08-14-2017 @ 8:14 AM

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it's the one where the lights are on in the in position

ken ct.

08-14-2017 @ 3:24 AM

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These are 1 of the hardest things to find and command top prices when found. It is NOT a dimmer switch. Just an on & off switch. Their are 2 diff. ones from 34 to 39 ithink. 1 the lites are ON in the out position and the other one has the lites on in the IN position. Finding a good one is almost impossible, GOOD LUCK. ken ct.

Bob56

08-14-2017 @ 2:36 AM

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Sorry guys, this is a 1936 club cab. It's the dimmer switch that I am working on. It has two bullet connections on the back and they seem snug.Where can I get a switch, haven't found any in the catalogs for a 36

This message was edited by Bob56 on 8-14-17 @ 2:38 AM

sarahcecelia

08-13-2017 @ 2:19 PM

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This post belongs on the 1940 threads.

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