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EFV-8 Club Forum / General Ford Discussion / 1939 Ford Wiring Daigram

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Discussion Topic: 1939 Ford Wiring Daigram -- page: 1 2

JayChicago

12-13-2017 @ 5:31 PM

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I think you called that right: that's something added by a previous owner. Probably because they couldn't find the source of the problem in the original ignition circuit, so they added a second feed to the coil. At least they were aware enough to include a ballast resister.

Frosty

12-11-2017 @ 8:14 PM

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I hooked up the battery to the ignition side of the ballast resistor which is installed on the engine side of the firewall and get a reading of 2.5 to 3 v going out the other side to the coil. I've only done this to get the engine started for a few minutes to check out the engine. I'll be checking out the ignition switch next to see what the problem is.
I restored a 1938 Fordor a few years ago and don't recall that there was a ballast resistor on the engine side of the firewall. Is this perhaps something that the previous owner installed for some reason or is it a normal part of the wiring for a 1939? The car does have the fuse block and resistor under the dash.

TomO

12-05-2017 @ 7:19 AM

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Jay, I was taught to use Vaseline on switches back in the early 1950s and have had no problems because I used it. I last cleaned my ignition switch in 1977 and my dimmer switch in 2005. I used Vaseline in both of them. Bulb grease is a fairly new product, that became available in the 1990s to use on the new style bulbs. It would probably work just as good and maybe a little better.

Tom

JayChicago

12-04-2017 @ 12:58 PM

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I believe the 3-1/2 to 4 volts at the coil is only when everything else in the electrical system is optimum, like with a good fully charged battery reading 6.5 volts, or when engine is running. As I learned the hard way, if your battery is a little discharged, like what happens when you've been in the garage trouble-shooting a while, battery now reading 6.0 volts, I think the reading at the coil will be closer to 2.5 volts.

I measured voltage drop across several different resistors and found all were very close to a full 3 volts.(with engine stopped) And you can expect another few tenths of a volt drop thru the ignition switch and rest of the circuit. So, with engine stopped, the total voltage drop ahead of the coil is 3 to 3.5 volts.

JayChicago

12-04-2017 @ 11:35 AM

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TomO
OK to use Vaseline? I use light bulb grease in such applications, because I feel safe it is formulated to protect the metal surface while still conducting electricity well. But I would have been afraid to use some other grease, afraid it would be a dielectric, adding resistance to the circuit. Maybe I'm just over-thinking again. Is it just that any resistance from such a thin film of grease is negligible?

ford38v8

12-03-2017 @ 10:27 PM

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Frosty, If you have hot-wired it past the ignition switch, you likely will have also bypassed the ignition resistor, located on the dash above the steering column. Bypassing the resistor is ok for a short duration, but will fry the coil and points if permitted to run with the full 6v battery voltage directly to the coil.

If you check voltage at the coil, you'll get full voltage unless the points are closed, at which time you'll read the resistor, which drops voltage by about 2v. The engine is happiest with 3 1/2 - 4 v.

Alan

TomO

12-03-2017 @ 2:38 PM

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You can remove the ignition switch and clean it, then re-install it.

I like to use a pencil eraser to clean off light corrosion and add a little tension to he switch brush. Put a thin coat of Vaseline on the switch plate to slow down the corrosion.

Tom

mrtexas

12-02-2017 @ 2:30 PM

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There is not a lot of detail for 39 cars. Wiring is very simple.

Frosty

12-02-2017 @ 2:09 PM

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After checking out the wiring, I found the ignition switch was the culprit. I bypassed the switch and managed to get the engine started.

Thanks for the comments & suggestions.

Frosty

Frosty

11-28-2017 @ 12:28 PM

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Thanks Tom.

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