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EFV-8 Club Forum / General Ford Discussion / 37 ford radio wiring

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Discussion Topic: 37 ford radio wiring -- page: 1 2

1937sedandelivery

05-10-2019 @ 8:07 AM

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Well, that is a bummer. Perhaps someone can validate what I described. The 12V rated switch should be fine.
If you didn't already, you could wire up everything except the connection to the radio. Flip the switch and verify that it works and the voltage to the radio connection is correct.
If you have a volt/ohm meter, you could measure the resistance of the radio hot wire. Measure from the hot wire to a good ground point on the case. Good chance there is a low resistance short to ground in the radio.
Another easy way to test the radio resistance is put it on a bench and apply a fused 6V source to the hot wire (also connect wire between voltage source and ground. Since the car is a positive ground system, you would be connecting the minus side of the source to the hot wire and the positive side to the case ground.
Meantime, take a couple "singing" courses and surprise everyone

gregg

jakes

05-10-2019 @ 4:47 AM

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Gregg, I wired the radio as to how yours was wired, and installed a new toggle switch. Blows fuses right away. The toggle switch that I bought is a 12v switch but I don't believe that would matter, or does it? Oh well, maybe I just have to sing while driving. Not a pleasant experience!
Thanks again for your help.
Jakes

1937sedandelivery

05-02-2019 @ 9:29 PM

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Hey Bob,
Oh, that is good news. Thought I would have to have some funky new speaker made. Will PM you as things progress.
Thanks for the info.
gregg

fenbach

05-02-2019 @ 8:20 PM

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A modern speaker will work fine. 8 ohms is best. Just connect one lead to the audio socket and the other to ground. I found that I could reduce the background hum by running the ground wire all the way back to the radio rather than connecting it to the body. Or use the original shielded harness if you have it. You can send me a PM if you have questions along the way. I learned to fix these old Ford radios about 10 years ago and enjoy working on them. Even long distance.
Bob

1937sedandelivery

05-02-2019 @ 8:35 AM

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200V? What the heck! I will give it its due respect.
Thank you very much for letting me know.
My speaker is totally shot, what to do?

gregg

jakes

05-02-2019 @ 4:33 AM

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Gregg, thanks for all of your photos. The wiring on the back of the control of mine is a little different. Mine has the lamp wire soldered to one of the blue wires to the contacts. I guess either way will work. Being that my car is a convertible with the speaker built in, the boxes would be different. It won't be until next week that I'll have the time to wire it, but according to your description of the wiring , I should not have any problems. I'll let you know how it turns out. Thank you very much, you have been a big help.
Jakes

fenbach

05-01-2019 @ 10:06 PM

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a heads-up for Gregg. if you have the original 3-wire speaker harness with the 3-prong plug attached, just plug it in. otherwise BE CAREFUL. the voltage to one of the sockets is roughly 200DC. which will get your attention! set the radio on its side so that the 3-hole jack is towards the bottom. as best I recall, the socket on the right [closest to the tone knob] is the high voltage. the one at the left is audio [low voltage AC]. the one off by itself at the bottom is 6 volts DC for the speaker magnet. not used with a modern speaker. ground is the cable shield. check the DC voltages with a meter to be sure. my recollection could have shorted out.
and jakes, looks to me like the cover of your radio is off by 180 degrees. the 2 brass spring clips mounted to the cover should rest on the metal plate that spans the radio.
if the radios don't perform well, the capacitors and the vibrator probably need replacing. something i'd be glad to do. shipping back and forth would run nearly $100, tho.
bob

1937sedandelivery

05-01-2019 @ 7:17 PM

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I traced out the "hot" wire to the radio.
It starts at the fuse block (after the fuse).
From the fuse block to the toggle switch.
From the toggle switch to the radio head on/off switch.
From the on/off switch to an inline fuse holder (I was surprised, but it looks stock)
The other end of the fuse holder is connected to the radio's hot wire.

It appears to me that the fuse holder requires a special insulated fuse. I will probably replace it with a new modern one.

gregg

TonyM

05-01-2019 @ 6:17 PM

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1937 Ford Glove Box Radio Toggle Switch.

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.
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78-730B

1937sedandelivery

05-01-2019 @ 1:51 PM

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and a few more pics...
Let me know if you need more pics, e.g. the toggle switch in the glove box.
gregg

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