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Jump Starting a 6V Car


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Let me throw another can of gas on the fire. I bought my ‘46 gmc pickup in 1997. When it needed a battery, the fellow at my local battery warehouse convinced me to try their 8-volt battery. The truck has no radio and is rarely (never!) driven at night, NTL- it has never blown a bulb. He instructed me to adjust the voltage regulator to 10 volts and that keeps the battery happy.

As it sits for months I keep an 8-volt Battery tender on it. The Battery Warehouse batteries have averaged 7-9 years of life.

Many will remember Sol who used to be a vendor at Carlisle and Hershey, selling Battery Tenders and Paint remover.  I asked him early on about an 8-volt unit and he told me they were no longer available; but he would “prod” the manufacturer about making another run. Several months later, at Hershey, he handed me my new tender. It’s over 20 years old now and has never been unplugged for more than a day.

We could get along fine with a 6-volt battery, all the cables and such were new when I bought the truck- but the 8-volt spins the starter better and gets the truck going faster. 

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On 2/25/2021 at 6:39 AM, greenie said:

When it needed a battery, the fellow at my local battery warehouse convinced me to try their 8-volt battery.

This was and still is a common practice on old tractors with 6v systems. Makes starting them in the winter much easier. 

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16 hours ago, supercub said:

Yeah right

 

Yes, Right! It is was a real product, a 12 volt battery with a (or two) solenoid to parallel three cells with the other three cells for running/charging and series connecting 6 cells for starting. Pfeil has a link.

 

Real answer is not buying a 6/12 volt battery or an 8 volt battery, but just fix the car. they started fine in all sorts of weather when they were new!👍

Edited by Frank DuVal (see edit history)
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I agree, they must have worked fine back in the day. I had a 6V bike that started just fine, after sorting out the wiring issues, the headlight gave a good brilliance and it started easily, worked just as good as a 12V.

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There is nothing in the lead acid battery ITSELF that could or will explode. A product of the charging process is hydrogen and oxygen (an explosive mixture) that can remain in the battery for some time. Disconnecting the jumper can cause a spark that ignites the gas mixture in the battery. It happened to me during a 12V to 12V jump. Quite the surprise.

Using a 12V or 6V battery as the jumper battery does not mean a thing. The ignition source, the spark, is the only thing that matters........Bob

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BTW I remember that early hydramatics (at least pre-fire) did have a rear pump and could be push started. Do not know when it was dropped.

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2 hours ago, padgett said:

BTW I remember that early hydramatics (at least pre-fire) did have a rear pump and could be push started. Do not know when it was dropped.

Yes, a front and rear pump. Was dropped when Controlled Coupling Hydramatic came out in 1956 in Cadillac, Pontiac StarChief and Olds 98. Except that 1956 Pontiac 870 & 860 and Olds 88 used the old Hydro , and in 57 they all switched to the new trans. Also Roto can't be pushed started either.

 

 

Edited by Pfeil (see edit history)
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My Hudson FSM for the hydramatic says that it can be push started at 20mph. 

I think the battery explosion is from the cell separators giving out from the induced 12v, that would short out the cells.

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1 hour ago, supercub said:

My Hudson FSM for the hydramatic says that it can be push started at 20mph. 

I think the battery explosion is from the cell separators giving out from the induced 12v, that would short out the cells.

That's because you're Hudson has a first generation G.M. Hydramatic which has a front and rear pump. 

Edited by Pfeil (see edit history)
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BTW both 6v and 8v batteries are common for golf carts. Sam's has both. Even has a 6v AGM.

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On 2/27/2021 at 9:06 PM, Pfeil said:

Yes, a front and rear pump. Was dropped when Controlled Coupling Hydramatic came out in 1956 in Cadillac, Pontiac StarChief and Olds 98. Except that 1956 Pontiac 870 & 860 and Olds 88 used the old Hydro , and in 57 they all switched to the new trans. Also Roto can't be pushed started either. my 57 eldorado with 365 would start with a 30 mph then pusher back off worked many times over the years.

 

 

 

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2 hours ago, 54vicky said:

 

The drivetrain on a 57 Eldorado has a 315 HydraMatic which is called a Controlled Coupling HydraMatic. There is NO rear pump in this transmission. No rear pump means you cannot pressurize the transmission to turn the engine over at ANY speed. Perhaps someone put a dual range slant pan HydraMatic in there which in that case would be possible to start by pushing.

 Look in your 1957 El Dorado owners manual, it will tell you what I've just said.  

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I never took the time to read it just got pushed when needed.I guess owning it for years it was easier than reading what I could not do.try owning one rather than reading I suppose next you will say I would not be able to put a 58 385 in it WRONG

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7 minutes ago, 54vicky said:

I never took the time to read it just got pushed when needed.I guess owning it for years it was easier than reading what I could not do.try owning one rather than reading I suppose next you will say I would not be able to put a 58 385 in it WRONG

 Still a 365 in 1958, besides Cadillac never made a 385😉

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