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12-08-2020, 10:14 PM | #1 |
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Location: Cleveland, Ohio
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12 volt negative ground tachometer wiring on 1929 model A
I converted to a 12v negative ground system on my 29 A and am wanting to hook up a 12v tachometer but am not sure how to correctly wire it in. The Tach is from Snyder’s and I have all brand new wiring in the entire car. I also am running an alternator instead of a generator. Please don’t bash me on doing the 12v conversion. Already got enough flack from the Di-hard A’ers. Thanks for any assistance. Probably stupid easy but just want to make sure I’m wiring it correctly.
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12-08-2020, 10:32 PM | #2 |
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Location: Fort Gratiot, Michigan
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Re: 12 volt negative ground tachometer wiring on 1929 model A
welcome to the Barn. I’m sure you’ll get the information you need. Wayne
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12-08-2020, 10:33 PM | #3 |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
One lead to ground, the other to the point-side of the coil
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12-09-2020, 02:02 AM | #4 |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
I installed a tac in my 6-volt positive ground Victoria. A 12-volt version would hook up the same way. The two leads from the tac go to the two primary terminals on the coil, just observe polarity.
The attached article is about my installation. Tom Endy |
12-09-2020, 12:11 PM | #5 |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
Did you see the instructions on Snyder's site?
https://www.snydersantiqueauto.com/R.../A-12120-B.pdf |
12-09-2020, 02:21 PM | #6 |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
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12-09-2020, 03:05 PM | #7 |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
If the ignition switch is wired as original then sounds like the coil is wire backwards
for 12V negative ground. |
12-09-2020, 03:16 PM | #8 | |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
Quote:
Last edited by Y-Blockhead; 12-09-2020 at 04:47 PM. |
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12-09-2020, 04:04 PM | #9 |
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Location: SouthWest Michigan
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Re: 12 volt negative ground tachometer wiring on 1929 model A
Normally it goes
Red to 12v ing. Black to ground Green to - neg side of coil Yellow is for the light Sent from my iPhone using Tapatalk |
12-09-2020, 04:53 PM | #10 |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
"Normally" I would agree with you but the tach the OP is asking about only has 2 wires...
Last edited by Y-Blockhead; 12-09-2020 at 05:02 PM. |
12-09-2020, 07:56 PM | #11 | |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
Quote:
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12-23-2021, 02:39 PM | #12 |
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Location: Lithia, FL
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Re: 12 volt negative ground tachometer wiring on 1929 model A
My Model A was converted to 12V and will be installing a Bosch Retro Tach which comes with 4 wires. Although I know where to connect the Ground, Light, and Signal wires, I am not sure about the Power wire. My Les Andrews Book (Vol II) in the Tachometer Installation section calls for the Power wire to be connected to the passenger side Terminal Box Post however when I put my test light on one of the already connected wires, it lights. Since the Bosch instructions call for the Power wire to be connected to any wire that is energized ONLY when the ignition is on, I am reluctant to go by the guidance in Les Andrews book. Maybe I am wrong but would greatly appreciate any guidance and Merry Christmas. Best, Steve
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12-23-2021, 04:00 PM | #13 | |
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Re: 12 volt negative ground tachometer wiring on 1929 model A
Quote:
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