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Old 06-13-2024, 07:35 AM   #1
Canton_Model_A's
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Default Fixed - 1929 Model A With 12v Conversion

Morning fellow Barn-ites.
I am slowly doing more repairs to my '29 'A' and I just received a new dash panel to allow my restored Pop-Out to finally be installed. My next question, it has the normal 20-0-20 Ammeter and I have heard that for ones that have undergone the conversion to 12v to use the 30-0-30.

I have noticed that when I accelerate I 'bury' the needle on the 20a charge side. Should I invest in the 30-0-30 from the normal suppliers or should I go the Westach line.

Thanks!

Dave
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Last edited by Canton_Model_A's; 06-17-2024 at 10:24 AM.
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Old 06-13-2024, 09:16 AM   #2
katy
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Default Re: 1929 Model A With 12v Conversion

Generator or alternator?
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Old 06-13-2024, 09:47 AM   #3
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Default Re: 1929 Model A With 12v Conversion

Alternator
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Old 06-13-2024, 10:08 AM   #4
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Default Re: 1929 Model A With 12v Conversion

Use the 30 amp ammeter with an alternator. Also install a voltmeter in addition to the ammeter. The alternator will stop charging when the battery gets fully charged at about 14 volts. At that point the ammeter will read zero and the voltmeter will read about 14 volts.
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Old 06-13-2024, 11:20 AM   #5
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Default Re: 1929 Model A With 12v Conversion

any suggestions on the volt meter get the one from the typical suppliers with the bracket? I will get the 30-0-30 meter.
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Old 06-13-2024, 12:47 PM   #6
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Default Re: 1929 Model A With 12v Conversion

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https://www.speedwaymotors.com/AutoM...ch,113373.html

Make sure it fits the bracket available from the suppliers.

Here is the bracket: https://modelastore.com/accessories/...roduct_id=4872

There is room for a second gauge. Berts has temperature and oil pressure gauges.
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A is for apple, green as the sky.
Step on the gas, for tomorrow I die.
Forget the brakes, they really don't work.
The clutch always sticks, and starts with a jerk.
My car grows red hair, and flies through the air.
Driving's a blast, a blast from the past.
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Old 06-13-2024, 01:23 PM   #7
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Default Re: 1929 Model A With 12v Conversion

I use a Volt Meter instead of amp gauge, fits in same hole.

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Old 06-13-2024, 08:19 PM   #8
Charlie Stephens
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Default Re: 1929 Model A With 12v Conversion

Provide a path for half of the current to go around the ammeter. The photo shows what I did in my '32 where there is plenty of room behind the dash. The loop in the wire is to make the resistance equal to the internal resistance of the ammeter. In a Model A maybe run a second wire (10 gauge, assuming that is what is currently going between the alternator and the ammeter) from the output of the alternator and connect it to the to the other side of the ammeter. Now all you need to do is remember the reading is half of the actual.

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Old 06-14-2024, 11:59 AM   #9
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Default Re: 1929 Model A With 12v Conversion

This will fit in the stock ammeter hole, available from Amazon
Autometer #2356 . It’s a 1.5 inch gauge.
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Old 06-17-2024, 10:17 AM   #10
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Default Re: 1929 Model A With 12v Conversion

ok I got the 30-0-30 Ammeter from the normal supplier. Also had an issue Yesterday when it would not start, new battery, checked fuse. just for giggles, removed the old 20-0-20 meter out and put the new 30-0-30 in, and boom, it started. so it appears it was a faulty ammeter.

Now to continue getting the new wiring harness installed.
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Old 06-17-2024, 02:58 PM   #11
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Default Re: Fixed - 1929 Model A With 12v Conversion

It started with a boom? Check for fuel leaking into the muffler.
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A is for apple, green as the sky.
Step on the gas, for tomorrow I die.
Forget the brakes, they really don't work.
The clutch always sticks, and starts with a jerk.
My car grows red hair, and flies through the air.
Driving's a blast, a blast from the past.
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Old 06-18-2024, 06:52 AM   #12
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Default Re: Fixed - 1929 Model A With 12v Conversion

nah no boom, more of "it started". I would hope no boom!

I just want to thank everyone here at the Barn for all the help, insight and information, it is all very helpful!, that and the Les Andrews bible
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Old 06-18-2024, 09:02 AM   #13
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Default Re: Fixed - 1929 Model A With 12v Conversion

Thanks for the update.
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