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Jumping 6v with 12v.

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Joel B.

08-21-2001 08:36:33




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Is it really safe to do this? Everything tells me you shouldn't apply 12 volts to a 6 volt starter. How many of you have actually done this with no harmful effects? Gotta admit, I'm a little leary of jumping this way.

Joel B.




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Bob

08-21-2001 19:11:46




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 Re: jumping 6v with 12v. in reply to Joel B., 08-21-2001 08:36:33  

Dell and others would shoot me,,,Long before I found this site, I swapped my 47-2N's 6 volt battery for a 12 volt (swiped it from my wife's 67 Camaro). JUST the battery. That baby spins over and starts in two "R""R"'s. My generator bracket cracked, so I put a Chrysler alternator in as a belt idler pulley. I'll connect it someday, so I don't have to charge the battery every month. Bob



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John Allgood

08-21-2001 10:51:59




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 Re: jumping 6v with 12v. in reply to Joel B., 08-21-2001 08:36:33  
I like the Zane way posted by Salmoneye, but would add one thing. If the post of the starter has threads sticking up as most do, put another nut on to protect the threads in case you ever want to take the cable off. This method is like having a small welder and just messes up threads really bad.



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ron

08-21-2001 10:27:16




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 Re: jumping 6v with 12v. in reply to Joel B., 08-21-2001 08:36:33  
I have the original 6 volt starter in my '46 chevy with a 12 volt conversion with no problems at all.



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Steveo

08-21-2001 09:37:26




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 Re: jumping 6v with 12v. in reply to Joel B., 08-21-2001 08:36:33  
Joel, I've done it succesfully a couple times after a friend told me that he'd done also. I went directly to the battery, but I like the idea of bypassing it and tying directly to the starter.



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paul

08-21-2001 11:02:58




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 Re: Re: jumping 6v with 12v. in reply to Steveo, 08-21-2001 09:37:26  
Going through the batterys is asking for trouble, you must never have seen a battery explode. Well, you don't actually see it, just hear a very loud boom & there is plasic & acid everywhere. My hearing did come back in a few seconds. (My battery just developed a short, didn't do anything wrong...)

If that doesn't worry you, you are putting a heck of a strain on your whole electrical system, as gauges, lights, regulator, points, etc. all get double the volts it should be getting, and none of these parts deal with it well.

I'd rather pull a tractor than try to jump it with a 12v battery, but if you are careful to only energize the starter itself it does work without harming the starter. Only hold down the starter switch about 1/2 as long as you normally would tho, don't grind away with 12 volts on a non-starting engine. A starter is designed to take a lot of electrical power for short time periods, so the 12 volts for a shorter time is no harder on it that 6 volts for a longer time...

--->Paul

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Steveo

08-21-2001 12:43:47




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 Re: Re: Re: jumping 6v with 12v. in reply to paul, 08-21-2001 11:02:58  
Thanks for your concern Paul, I have no lights (if I did they would be switched off during a start attempt), only gauge using power is oil pressure, and points will handle more current than the wires going to them will. Believe me, I was careful, the car I jumped from was NOT running (to prevent possible damage to its alternator or regulator), and I made the final connection while standing AWAY from either battery, and only for as long as it took to start the tractor (few seconds). I'm sure most of the current from the 12V battery went through the (dead) 6V batt. in the tractor and the starter. You tend to try things you wouldn't normally do, when your power's been out for 20 hrs., it's 10 degrees and you've been snowed in at the end of a half mile driveway for two days and need to plow.

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Phil (AZ)

08-23-2001 13:07:44




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 Re: Re: Re: Re: jumping 6v with 12v. in reply to Steveo, 08-21-2001 12:43:47  
Stevo, The math is instantanious V1 + V2 /N , that is (12+6) /2 = 9 Volts . One battery loses 3 Volts and the other gains 3V at the junction. Unless you are using lamp cord for jumper cables bad sh*t is going to happen.
FYI:
The math is the same reason that AAA trucks use 2 batteries in parallel (V1+V2+V3/N) such that the dead battery has less affect when jump Starting.

JMHO



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Don (NC)

08-21-2001 09:31:42




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 Re: jumping 6v with 12v. in reply to Joel B., 08-21-2001 08:36:33  
I jumped mine recently using the recommended procedure...no problems.



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Salmoneye

08-21-2001 09:03:03




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 Re: jumping 6v with 12v. in reply to Joel B., 08-21-2001 08:36:33  
The link below is a post from ZANE still on this page.
Follow his excellent advice and you will have no problems...



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noff

08-21-2001 08:47:43




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 Re: jumping 6v with 12v. in reply to Joel B., 08-21-2001 08:36:33  
The way I understand it from people here on the board is..... All N starters are 6 volt starters.
there are no 12 volt N starters out there. You just don't lean on the starter button for too long at a time. I personally would be nervous about the rest of the electrical system jumping from a 12 volt system to a 6 volt system but the starter I have no worries about.



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