Forum: Model A (1928-31)
01-21-2021, 10:32 AM
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Replies: 17
Views: 621
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Forum: Model A (1928-31)
01-16-2021, 10:15 AM
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Replies: 32
Views: 1,409
Re: 12v from 3 brush Ford generator
Depends on forward voltage drop (Vf) of the particular diode. If you can't find the spec sheet, figure 1 volt drop: 1V x 20A = 20W. Grab onto a lit 20W bulb to find out how much heat sink is...
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Forum: Model A (1928-31)
01-16-2021, 09:49 AM
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Replies: 16
Views: 1,056
Re: Accessory fuse panel
To use the original 12 AWG wiring the ammeter should be on a 20A branch circuit serving the battery, with the fuse panel sourced from the generator. The battery normally draws about 1A charge so the...
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Forum: Model A (1928-31)
01-15-2021, 10:04 AM
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Replies: 23
Views: 771
Re: Headlight Help
Another method places the SB behind the original lens, and as you say the double diffraction "confuses" the beam.
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Forum: Model A (1928-31)
01-15-2021, 10:02 AM
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Replies: 23
Views: 771
Re: Headlight Help
Those are the 8" to 7" adapters for standard sealed beams. Makes the car look bug-eyed.
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Forum: Model A (1928-31)
01-14-2021, 10:36 AM
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Replies: 23
Views: 771
Re: Headlight Help
I should add that 12V systems reduce current requirements by half, which doubles generator power capacity. The generator can thus handle the load of 50 CP bulbs without overheating.
Of course, a...
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Forum: Model A (1928-31)
01-14-2021, 09:57 AM
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Replies: 19
Views: 579
Re: "Flickering" low bean headlights
Connect a #18 or larger wire between each conduit and the forward hood latch screw on each side. Tin 1/2" at one end and tuck under a steel hose clamp on the conduit inside the radiator shell and...
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Forum: Model A (1928-31)
01-13-2021, 12:34 PM
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Replies: 23
Views: 771
Re: Headlight Help
The brightest bulb Ford authorized for model A was 21/32 CP, A-1116. 32 CP stresses the capacity of the generator, and should be used sparingly. Obviously overuse of 50 CP can shorten the life of...
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Forum: Model A (1928-31)
01-12-2021, 08:36 AM
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Replies: 4
Views: 424
Re: LED Tail Lamp Bulb
Sort by "BA15S" -
https://www.ledlight.com/1129-81-ba15s-base-led-lightbulbs.aspx
68798-WW (warm white) is what I have
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Forum: Model A (1928-31)
01-10-2021, 10:22 AM
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Replies: 23
Views: 891
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Forum: Model A (1928-31)
01-07-2021, 10:40 AM
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Replies: 63
Views: 3,921
Re: Signs, back in the day
I was a kid in Oglesby, IL, the street signs were 4x4 concrete obelisks about 4' high. The paint faded and had to be restencilled every year or two. Probably replaced by now.
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Forum: Model A (1928-31)
01-06-2021, 09:26 AM
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Replies: 14
Views: 1,025
Re: Horn, for what?
http://modelabasics.com/
Just about everything you need to know about everything.
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Forum: Model A (1928-31)
01-05-2021, 02:41 PM
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Replies: 6
Views: 396
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Forum: Model A (1928-31)
01-05-2021, 09:39 AM
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Replies: 6
Views: 396
Re: Rewiring horn and wiper motor for 12 volts
You need to double the number of turns to get the same current. Flux density is a function of field current. You can use a slightly smaller wire gauge so it fits. Much easier to use a 1.2 ohm 50...
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Forum: Model A (1928-31)
01-04-2021, 10:24 AM
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Replies: 32
Views: 1,409
Re: 12v from 3 brush Ford generator
@jrelliott - You're right about the FP regulator. It is a shunt regulator, which means it simply dumps excess generator power to ground. I figure it wastes about 1 HP at the high end. 1 horse...
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Forum: Model A (1928-31)
01-02-2021, 10:50 AM
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Replies: 6
Views: 335
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Forum: Model A (1928-31)
12-31-2020, 10:42 AM
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Replies: 32
Views: 1,409
Re: 12v from 3 brush Ford generator
The "button" diodes (3 of them) are pressed into the deeper recesses of the aluminum rectifier heat sink in an alternator. A better choice for cutout mod is a stud mount type with heat sink compound...
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Forum: Model A (1928-31)
12-31-2020, 10:20 AM
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Replies: 32
Views: 1,409
Re: 12v from 3 brush Ford generator
Math's ok but not the reasoning. If the gen actually is capable of 22A at 6V without melting then it is capable of 22A at 12V as well. This means if you get 132 watts output at 6V then you get 264...
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Forum: Model A (1928-31)
12-30-2020, 10:27 AM
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Replies: 63
Views: 3,921
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Forum: Model A (1928-31)
12-30-2020, 10:19 AM
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Replies: 32
Views: 1,409
Re: 12v from 3 brush Ford generator
Correct.
Not very well. The operate point is different, should not cut in before output reaches battery voltage. You can find 12V cutouts online.
Diode cutouts are one-way valves and work...
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Forum: Model A (1928-31)
12-30-2020, 10:04 AM
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Replies: 32
Views: 1,409
Re: 12v from 3 brush Ford generator
The generator itself needs no modification. Connect the battery through a switch and cutout*. Polarize the generator if necessary by touching hot battery to the output post for half a second. ...
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Forum: Model A (1928-31)
12-28-2020, 10:08 AM
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Replies: 13
Views: 824
Re: Fun Projects Cutout
With original 21 CP headlamps, single 6 CP tail light and normal battery charge, the generator draw is approximately 15A. With lights off, it should be around 6A. There's something wrong with that...
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Forum: Model A (1928-31)
12-27-2020, 09:57 AM
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Replies: 28
Views: 1,532
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Forum: Model A (1928-31)
12-27-2020, 09:48 AM
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Replies: 18
Views: 952
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Forum: Model A (1928-31)
12-26-2020, 09:34 AM
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Replies: 28
Views: 1,532
Re: Spark plug socket
The first time I heard the term "spanner" was in a NATO motor pool 50+ years ago. The bloke was holding one in his hand, so I caught on right away what he meant. I suspect "wrench" was just as...
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