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Re-affirmation needed: Jumping a 6V +Grnd with 12V -grnd

 
General Discussion
Last Post by GeoffOverley 13 years ago
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 ralphbohm
(@ralphbohm)
Estimable Member
Joined: 13 years ago
Posts: 120
Topic starter October 28, 2012 1:42 pm  

Can it be done?

This starter is just turning over so slowly and the battery is brand new.

If I shut everything off, can I jump this 6V +ground car with a 12V battery?

Most Sincerely,

Ralph M Bohm
'50 Desoto CarryAll


   
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 RodgerReddish
(@rodgerreddish)
Reputable Member
Joined: 15 years ago
Posts: 393
October 28, 2012 2:40 pm  

Ralph

The final answer is ... yes you can use an 12 Volt Battery with your 6 Volt System.

you must only have the jumper cables from battery to battery. Positive Post to Positive Post and Negitive Post to Negitive Post.

As when any time jumping batteries the dead battery gets connected first ( your complete 6 Volt Battery ).

Rodger & Gabby
COS

FltSgt@outlook.com


   
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 ralphbohm
(@ralphbohm)
Estimable Member
Joined: 13 years ago
Posts: 120
Topic starter October 28, 2012 3:27 pm  

Ralph

The final answer is ... yes you can use an 12 Volt Battery with your 6 Volt System.

you must only have the jumper cables from battery to battery. Positive Post to Positive Post and Negitive Post to Negitive Post.

As when any time jumping batteries the dead battery gets connected first ( your complete 6 Volt Battery ).

Rodger & Gabby
COS

Okay, thanks Rodger. We are having a heck of a time. I've checked to make sure the plugs weren't fouled and they look good. We have a new rotor but still no new points or cap. Nevertheless, we are getting spark. To be sure, I've also switched out the coil. I've found that the carb is choked as normal when cold but I went ahead and opened the choke temporarily with a screwdriver just to get it started (like we used to do in the old days). It started to "catch" but still is not starting. I am going to shoot a little ether down it...

...and I have to find a battery. I'll be back soon...

Most Sincerely,

Ralph M Bohm
'50 Desoto CarryAll


   
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 lesfairbanks
(@lesfairbanks)
Reputable Member
Joined: 15 years ago
Posts: 251
October 28, 2012 5:52 pm  

Ralph, a couple of times when I had trouble starting my 52 with the starter it started easily with a push. Here is the the procedure with your fluid drive if you aren't famaliar with it. Start in low range, clutch engaged, the engine won't turn over until it shifts which it will do at about 8 mph. Turn on the ignition and release the clutch. It should start.


   
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 ralphbohm
(@ralphbohm)
Estimable Member
Joined: 13 years ago
Posts: 120
Topic starter October 29, 2012 6:44 pm  

Ralph, a couple of times when I had trouble starting my 52 with the starter it started easily with a push. Here is the the procedure with your fluid drive if you aren't famaliar with it. Start in low range, clutch engaged, the engine won't turn over until it shifts which it will do at about 8 mph. Turn on the ignition and release the clutch. It should start.

Hi Les!
We did exactly what you've suggested, and it worked.

Most Sincerely,

Ralph M Bohm
'50 Desoto CarryAll


   
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 GeoffOverley
(@geoffoverley)
Estimable Member
Joined: 14 years ago
Posts: 123
November 2, 2012 8:54 am  

Ralph,
6 Volt systems require more amperage to accomplish "work" so any unwanted resistance in the starting circuit will sap the amount of current required to crank the engine. Go through and clean up all of the connections in the starting circuit, especially on the ground side. Also make sure that the cables are of the proper gauge to be able to transmit the current.
See if this doesn't cure your "Slow Crank" condition.


   
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