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Old 09-10-2017, 02:36 PM   #1
Bill Lee/Virginia
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Default Possible Jump Start Damage Question

I received a Schumacher Model XPF750C Jump Starter/12V Power Source for my birthday. I have a Model A that is 6V Positive Ground.

Question: Can I Jump Start my 6V Positive Ground Model A with the 12V Jump Starter without causing any damage to the 6V battery or car?

I appreciate your advice and info.

Bill Lee/Virginia Peninsula
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Old 09-10-2017, 03:29 PM   #2
marc hildebrant
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Default Re: Possible Jump Start Damage Question

Hard to say...is the Power Source just a battery or an electronic device ?

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Old 09-10-2017, 04:31 PM   #3
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Default Re: Possible Jump Start Damage Question

In a pinch, a lot of people jump start their A's from a 12v car. Have not heard that it hurts, but you never know. I guess if all the lights are off, there is not much to hurt. The starter should take it unless you stay on it for a long time.
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Old 09-10-2017, 04:44 PM   #4
Patrick L.
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Default Re: Possible Jump Start Damage Question

It shouldn't hurt. If it hurts anything its the points. Just don't keep it hooked any longer than absolutely necessary.
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Old 09-10-2017, 05:28 PM   #5
RonC
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Default Re: Possible Jump Start Damage Question

Its easier to just push start it in third gear
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Old 09-10-2017, 05:40 PM   #6
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Default Re: Possible Jump Start Damage Question

Might not do your Alternator any good, if you are so equipped. Don't know about the regulators built into the cut out box, do they fry with 12V? I have 6V, positive Alternators on my two drivers so if one stalls out I either push start or if there is a bit left I hand crank. That is quite simple to do and my cars usually start with about 1/4 turn, if they are going to start at all. If not then I resort to my charger and time, lots of time,
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Old 09-10-2017, 05:59 PM   #7
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Default Re: Possible Jump Start Damage Question

Don't leave it on long. It will not be good for the battery in the charger OR the car battery. Make sure to remember positive gnd car gets red on the chassis. For short jumps it'll be fine.
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Old 09-10-2017, 06:15 PM   #8
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Default Re: Possible Jump Start Damage Question

I have jumped mine a couple times with my modern car without any issues. Disconnected right after it started. It's an odd feeling to connect the Model A side with the positive to ground while the 12-volt side goes with the traditional connection. You wouldn't want to have bumpers touching each other while so connected (Except that my 2005 Honda has all plastic bumpers)
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Old 09-10-2017, 06:19 PM   #9
Benson
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Default Re: Possible Jump Start Damage Question

Bad idea if car has 6 volt electronic ignition and you use 12 volt to jump start it.

Same MIGHT apply IF 6 volt turn signals ...

Last edited by Benson; 09-10-2017 at 06:37 PM.
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Old 09-10-2017, 09:08 PM   #10
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Default Re: Possible Jump Start Damage Question

Done it many times, no problems.

Sewall
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Old 09-10-2017, 09:16 PM   #11
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Default Re: Possible Jump Start Damage Question

My car came with the original "jump starter" under the seat. It's Z shaped and goes in the front of the crank.
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Old 09-10-2017, 09:23 PM   #12
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Default Re: Possible Jump Start Damage Question

Quote:
Originally Posted by Licensed to kill View Post
My car came with the original "jump starter" under the seat. It's Z shaped and goes in the front of the crank.

.....Or, always park it on a hill...
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Old 09-11-2017, 06:51 AM   #13
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Default Re: Possible Jump Start Damage Question

Quote:
Originally Posted by Licensed to kill View Post
My car came with the original "jump starter" under the seat. It's Z shaped and goes in the front of the crank.
My first model A was a yellow coupe with a worn out battery. I crank started it every time because I could not afford a new $15 battery.
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Old 09-11-2017, 07:25 AM   #14
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Default Re: Possible Jump Start Damage Question

A little push, pop the clutch, and away you go. No chance of burning anything up. Enjoy.
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Old 09-11-2017, 07:58 AM   #15
Afordman31
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Default Re: Possible Jump Start Damage Question

I know a fellow that used a 12volt on a 6volt and caused a spark and the top blew off the 6volt throwing acid all over. Luckily he didn't get it in the face.
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Old 09-11-2017, 08:22 AM   #16
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Default Re: Possible Jump Start Damage Question

used to do it with my 38 ford and every few times the condenser would blow...........
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Old 09-12-2017, 08:12 PM   #17
Bill Lee/Virginia
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Default Re: Possible Jump Start Damage Question

Many thanks to all of you who replied to my request.

Bill Lee/Virginia Peninsula
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Old 09-12-2017, 10:24 PM   #18
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Default Re: Possible Jump Start Damage Question

If you want to jump it with 12volts have someone engage the starter and just touch the terminal on the starter with the 12 volts. Works fine and will not hurt it with a momentary connection. Gary
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Old 09-13-2017, 09:57 AM   #19
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Default Re: Possible Jump Start Damage Question

Quote:
Originally Posted by Afordman31 View Post
I know a fellow that used a 12volt on a 6volt and caused a spark and the top blew off the 6volt throwing acid all over. Luckily he didn't get it in the face.
That can happen jump starting any vehicle. One of the many dangers of working on automobile!
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Old 09-13-2017, 02:50 PM   #20
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Default Re: Possible Jump Start Damage Question

That's why the last connection should be to the chassis, away from the battery.
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