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Old 02-09-2014, 10:23 AM   #16
OldPete
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2 brush starters(most bikes) 180 degrees... 4 brush starters(most cars) 90 degrees to reverse rotation.
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Old 02-09-2014, 11:00 AM   #17
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Eek Backwards charging

Yes, you can reverse charge a lead-acid chemistry. But, it will not have any capacity whatsoever. The battery is toast. It will self-discharge very rapidly.

Also, any battery that has been run to 0.0 volts is toast. Safe discharge levels for lead-acid chemistry is around 70% to 75% of float voltage. For a typical 12V battery that is about 10.5 volts (75% of 13.7V).

Batteries that are designed for deep discharge can be run down lower, but most are only rated to about 55%.

AGMs are more durable than flooded (wet-cell) batteries, but shouldn't routinely be run down below 70%. At 10.5V, there is very little capacity left in the battery.
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Old 02-09-2014, 01:18 PM   #18
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Quote:
Originally Posted by eric1514 View Post
6V yes, positive ground, no.

Wiring Diagram
''66 was the first year for 12v, 1300cc, & it was also the first year they dropped the dual link front end.
If my foggy memory is correct.
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Old 02-09-2014, 02:25 PM   #19
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Quote:
Originally Posted by Motomantra View Post
''66 was the first year for 12v, 1300cc, & it was also the first year they dropped the dual link front end.
If my foggy memory is correct.
66 was the only year of the 1300. It was still 6v. 12 volt happened in 67.

Scroll down to the middle of THIS PAGE if you don't wanna believe me.
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Old 02-09-2014, 03:19 PM   #20
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Quote:
Originally Posted by Motomantra View Post
''66 was the first year for 12v, 1300cc, & it was also the first year they dropped the dual link front end.
If my foggy memory is correct.
I had a '66 I cut up for a dune buggy. 6V, I remember my bud EXPLODING the battery jumping it with a 12 truck (running!! 13.6V!!) and the front end was the standard twin horizontal beams with torsional leaves. It was a 1300. Sure of that, after I blew it up, and had to buy cyls, pistons, head, etc
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Old 02-10-2014, 09:51 AM   #21
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Quote:
Originally Posted by concours View Post
This. The Brits had positive earth on cars and bikes.
So did the Yanks. My dad's Pontiac was 6 volt positive ground. Sometime in the late 50's it was discovered that negative ground was a better set up.
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Old 02-10-2014, 10:55 AM   #22
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Quote:
Originally Posted by eric1514 View Post
66 was the only year of the 1300. It was still 6v. 12 volt happened in 67.

Scroll down to the middle of THIS PAGE if you don't wanna believe me.
Thanks for the correction. Foggy times, back then.
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Old 02-10-2014, 12:40 PM   #23
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Many UK automotive applications were pos.(+) ground. My brother's Triumph motorcycle is + ground....Joe Lucas!!!??!!
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Old 02-10-2014, 12:56 PM   #24
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Original VW was link and pin front end with 2 torsion bars. At some point they switched to link and 2 ball joints, still torsion bars. The Super Beetle had McPherson struts and coil springs.

6 volt Fords were positive ground, as were 12 volt Lucas equipped Brit cars and bikes.
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Old 02-10-2014, 06:54 PM   #25
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Quote:
Originally Posted by concours View Post
I had a '66 I cut up for a dune buggy. 6V, I remember my bud EXPLODING the battery jumping it with a 12 truck (running!! 13.6V!!) and the front end was the standard twin horizontal beams with torsional leaves. It was a 1300. Sure of that, after I blew it up, and had to buy cyls, pistons, head, etc
Never seen that happen.

Jumped 6V porsches, tractors, trucks etc.

I have an 8V battery around specifically these days for when such vehicles act up.
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Old 02-13-2014, 09:07 AM   #26
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Assuming things are as they should be are often the culprit...

My BIL had a little honda car, local shop made an engine swap with a complete motor including accessories.

Tech could not get car to run correctly, different codes getting thrown out, sensors, wire harness, and ultimately the CPU was replaced over the course of a couple weeks. No go.... same issues. Bad CPU? tried 2 different ones... same result...

Tech ended up referring car to local dealer out of frustration, same thing, harness, cpu, same result...

At this point the car had been mulled over by a dozen people, ultimately it was the suggestion of a onlooker at the dealer that someone ought to replace the alternator.

Problem solved, alternator was supplying dirty current to system and ultimately causing the erratic behavior and apparent wire harness and cpu issues..

80$ part literally caused thousands of dollars of labor and parts swapping and stumped more than a dozen people.
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Old 02-14-2014, 05:44 AM   #27
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Quote:
Originally Posted by trailer Rails View Post
I seem to remember a car that was produced where the cassis was positive. Like a MG or something.
My neighbor has a BSA Royal Star and it's a positive ground. It also has specially sized nuts & bolts so you had to buy their tool to open just about anything. Brits.
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Old 02-14-2014, 08:31 AM   #28
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Anybody know why they switched to negative ground? A positive ground system will reduce the corrosion if the wiring gets wet.
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Old 02-14-2014, 10:33 AM   #29
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Quote:
Originally Posted by riverflow View Post
My neighbor has a BSA Royal Star and it's a positive ground. It also has specially sized nuts & bolts so you had to buy their tool to open just about anything. Brits.
They didn't do that on purpose. Whitworth was British standard at the time they were built. You should have been around 60 years ago when it wasn't possible to buy metric tools at the local store, either.
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Old 02-14-2014, 02:29 PM   #30
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Quote:
Originally Posted by GSWayne View Post
Anybody know why they switched to negative ground? A positive ground system will reduce the corrosion if the wiring gets wet.
Mostly for standardization.
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