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12-24-2021, 04:22 PM | #1 |
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Jump starting a 12V Positive Ground
Have not had to do this yet but I am sure some of you have. I would "assume," which is always dangerous, but Negative to Negative and Positive to Positive and in any given sequence to connect cables?
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12-24-2021, 04:41 PM | #2 |
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Re: Jump starting a 12V Positive Ground
Yes, of course.
Just make sure the bumpers aren't touching. (Old car steel bumpers that is.) |
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12-24-2021, 05:46 PM | #3 | |
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Re: Jump starting a 12V Positive Ground
Quote:
Mart .....Can you explain WHY? Play a game with me below. Suppose your pick-up was still 6v POS GROUND. You go out to start the truck one dark morning and the battery will barely turn the engine over. You know that if you could just get the engine to turn over fast enough, it will start. So, you back your T-bird out of the garage and line it up behind your truck, with bumpers TOUCHING. I will jump into the truck and help you accomplish the 'PUSH'. I will turn the ignition switch to "ON" in the truck. I will also push-in on the clutch, and put the truck transmission in 2nd gear. As I wave out the window for you to begin PUSHING the truck with your "beloved" T-bird, I turn-on the truck's light switch, as it is still dark outside. You begin pushing the truck. The truck battery is still strong enough to light my headlights somewhat. (REMEMBER, our bumpers are still in contact. The T-bird is 12v, NEG GROUND, & the truck is 6v POS GROUND. Both vehicles are sharing a GROUND through the bumper contact....AND IT CAUSES NO PROBLEMS!) As you build up a little speed with the T-bird, I ease out on the clutch, and the truck engine comes to life just like we knew it would. And even though both vehicles were sharing UN-LIKE grounds through the bumper contact, no sparks flew, the lights worked properly in both vehicles, and nothing was damaged. So if you will, please explain this bunk about not letting bumpers touch on vehicles with UN-LIKE grounding types. I'd like to know why that seems to be important. Years ago, I drew-up this comparison of how a 6v POS GND circuit and a 12v NEG GND circuit can safely SHARE a COMMON Ground, BELOW. Do you see ANY problems with this circuitry? DD Last edited by V8COOPMAN; 12-25-2021 at 12:11 PM. |
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12-24-2021, 10:17 PM | #4 |
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Re: Jump starting a 12V Positive Ground
I've started my six volt 52 Merc several times with a 12 volt boost but I by-pass the six volt battery. Just have the ignition on, touch one of the booster cables from the 12 volt to the starter side of the solenoid and the starter kicks in cranking real fast. Worked for me.
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12-24-2021, 10:35 PM | #5 |
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Re: Jump starting a 12V Positive Ground
Don't let the bumpers touch when you are jumping, Doesn't matter when you are pushing to start. If you let the bumpers touch when jumping it's the same as using 3 cables , your bumpers become the third cable hooking the two unlike grounds together causing big sparks. Not bunk.
Bill |
12-25-2021, 12:10 AM | #6 |
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Re: Jump starting a 12V Positive Ground
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12-25-2021, 10:06 PM | #7 |
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Re: Jump starting a 12V Positive Ground
For years in the 90s I daily drove a stock 38 tonner. As I got more into the hit n miss engines and other heavy stuff I bought a tandem axle trailer with electric brakes. The tonner still had cable brakes and they were quite effective, and 6v positive system. To operate the trailer brakes I mounted a 12 group 24 on the tongue set up negative ground and wired that way into the controller in the cab. Worked fine... Never used the cable brakes when towing. Years later I had this thought... Was that not a dead short somewhere? Mixing of 6 and twelve volts. Just seemed wrong. But never any problems... Dumb luck?
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12-26-2021, 12:35 AM | #8 |
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Re: Jump starting a 12V Positive Ground
Are you still into Hit& Miss engines? I've got a few.
Bill |
12-26-2021, 09:51 AM | #9 | |
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Re: Jump starting a 12V Positive Ground
Quote:
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12-26-2021, 08:00 PM | #10 |
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Re: Jump starting a 12V Positive Ground
To jump start a 12V positive ground from a 12 V negative ground, you should disconnect the cables on the 12V negative ground source. Just like jumping from a free standing battery
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12-26-2021, 08:18 PM | #11 |
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Re: Jump starting a 12V Positive Ground
Or don't let the bumpers touch.
Bill |
12-26-2021, 11:04 PM | #12 |
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Re: Jump starting a 12V Positive Ground
back in the 70’s, I would have to jump my 6v 55 Ford. I never owned a set of cables(some people who helped me did). But many a time I WOULD put the bumpers together and use a piece of scrap steel to jumper between batteries.
worked every time! With a few sparks of course! Since most cars were 12 V then, you didn’t want them touching very long anyway. |
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