Mag battery charger
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Topic author - Posts: 3873
- Joined: Fri Feb 12, 2021 12:24 pm
- First Name: john
- Last Name: karvaly
- * REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
- Location: orange, ca
- MTFCA Number: 14383
- Board Member Since: 2020
Mag battery charger
Finished engine magneto puts out 30- 35 volts a/c. Needs a way to keep the 8V battery charged for the starter & occasional evening driving.
Since fun projects isnt available, I built one similar to the one on my 14.
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Found an appropriately rated diode in the diode jar(pack rat) and a universal tail light socket. Color coded wires. (didnt have an old wire harness for cotton covered wires) All joints ere crimped & soldered.
This unit attaches to a longer upper steering column bolt.
First try used a 6V dual filament bulb. Put out 4 amps @ speed & blew.(would have worked on a 20-25V output mag)
Second try used a 12v 1157 bulb. Charges 1 amp above idle & 3 amps @ speed. Power goes thru the ammeter, so you can see it charging.
That should be enough to support the starter on day runs.
No effect on the ignition performance on mag.
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- Posts: 171
- Joined: Sun Jan 06, 2019 4:23 pm
- First Name: Neil
- Last Name: Haywood
- * REQUIRED* Type and Year of Model Ts owned: 1915 roadster
- Location: Stockbridge, MA
Re: Mag battery charger
My set up. Mag to light bulb in back kerosene lamp then through diode to battery
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- Posts: 387
- Joined: Sun Jan 06, 2019 7:19 pm
- First Name: Jack
- Last Name: Putnam
- Location: Bluffton, Ohio
- MTFCA Number: 13833
- MTFCI Number: 13353
Re: Mag battery charger
John: Where did you connect the red and yellow wires??
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Topic author - Posts: 3873
- Joined: Fri Feb 12, 2021 12:24 pm
- First Name: john
- Last Name: karvaly
- * REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
- Location: orange, ca
- MTFCA Number: 14383
- Board Member Since: 2020
Re: Mag battery charger
To terminal block. Red to magneto terminal. Yellow to yellow/black wire, where wire from generator output goes.Jack Putnam, in Ohio wrote: ↑Thu Jul 29, 2021 12:47 pmJohn: Where did you connect the red and yellow wires??