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Ignition switch for '51 F4

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Old 07-26-2011, 10:02 PM
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Ignition switch for '51 F4

Can anyone tell me what ignition switch was stock on a 1951 F4?

I'd like to get one with Ford keys, and the parts sites I've seen show various switches, key styles and often say they're for "pickups", so I don't know what to get.

Any help would be appreciated.

Joe
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Old 07-26-2011, 11:48 PM
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Subject to correction by the wise ones, 51 pick up (f1) and f4 should be the same. (OL-11572-A)
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Old 07-27-2011, 12:12 AM
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Thanks. I don't have any ignition switch. It looks like I need the cylinder and keys 8A-11582-A as well as a switch housing OL-11572-A.

Joe
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Old 07-27-2011, 07:02 AM
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Looks to me like the number for your switch is right, 0L 11572-A. But the keys and cylinder are 1A 11582-A. The number you listed is shown in the 1952 Chassis Manual as correct for the 48-50s. That number crosses to the number I listed in the 1964 reprint edition. You'll also need the switch retainer spring, if it's not included with the switch, 0L 11581 (or 1A 11581-B as listed in the 1964 manual), and maybe (if you don't have it) the bezel 0L 11580. These parts are common to all models. Stu
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Old 07-27-2011, 09:21 AM
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Thanks Stu. Just out of curiosity, what would be the difference between the 8A-11582-A and 1A-11582-A, I mean besides the first digit?
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Old 07-27-2011, 09:25 AM
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Today there is no difference since the later number has been substituted for the earlier number. Don't know what the original difference was. Stu
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Old 07-27-2011, 09:35 AM
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I'm glad to hear that, since I ordered the 8A last night. I didn't see the spring in the catalog, but I wasn't looking for it either. I did see the bezel, and I'll need to order one. Thanks again for the info. This site and you knowledgeable folks are making this project "start" a lot easier. I have not really "worked" on a car since my first... a '57 Ford Custom. But I had to work on that one constantly.
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Old 07-27-2011, 11:46 AM
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Interesting that you found it listed on that old number. I looked in the Carpenter and Mid-Fifty catalogs and see that they don't list it at all. Who'd you order it from? Stu
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Old 07-27-2011, 05:23 PM
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Old 07-27-2011, 08:52 PM
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Originally Posted by truckdog62563 View Post
Interesting that you found it listed on that old number. I looked in the Carpenter and Mid-Fifty catalogs and see that they don't list it at all. Who'd you order it from? Stu
I found it at
Obsolete & Classic Auto Parts.
Obsolete & Classic Auto Parts Online

They're not cheap, but they have a big selection.

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Old 08-06-2011, 09:02 PM
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Changing back to Positive Ground

My truck is currently wired negative ground. It starts and runs, and the ammeter indication is backwards (goes toward discharge with higher RPM).

I want to change it back to positive ground. I think the only thing I need to do after switching the battery leads is to polarize the generator before I start it. Is this correct? I have never polarized a generator, but found these instructions:

"
To polarize the generator, simply make a short jumper wire to short between the battery (b or bat) and generator (g or gen) lugs on the voltage regulator. Only a split-second or a spark is required, so simply tap your jumper wire onto the lugs and pull them right back off."

Will that work? My voltage regulator is marked "ARM" "FLD" "BAT" so do I short the BAT to the FLD or to the ARM> I'm assuming the ARM is the armature and the FLD is for Field, so I want to short the BAT to the FLD. Is that correct?

And the coil looks aftermarket. Does it matter if the ground is pos or neg for the coil to work?

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when I was a kid.
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Old 08-06-2011, 09:43 PM
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I want to change it back to positive ground.

Why? You'll be running 12 volts positive ground?
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Old 08-06-2011, 10:04 PM
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No, it's 6 volts. I'm going to leave it that way, at least for the foreseeable future. The battery is new. I'm going to rewire the entire truck, and I'm starting with this ground issue.
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