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post #11 of 23 (permalink) Old 07-03-2016, 07:33 PM
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The battery was in backward in the VW. It started and ran as if nothing was wrong. I asked a mechanic that owned a Alternator/starter shop and explained that if it was permanent magnet starter it would turn backward. But a field coil current starter will still run the right way to start the engine. The old point systems could run on reversed voltage but it reduced the spark output by about 30 % when the coil was hooked backward. If it is a newer bike with electronic ignition then it would probably ruin something. I would never believed it either if I didn't work on that old VW.

Only a biker knows why a dog sticks his head out of a car window.
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post #12 of 23 (permalink) Old 07-03-2016, 08:09 PM
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I have a friend that has a charger like that. it will tell you the "Reverse Polarity." or similar to it. What it is telling you is you have the cables reversed. Pos on neg cable
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post #13 of 23 (permalink) Old 07-03-2016, 08:51 PM
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Originally Posted by swifty2014 View Post
The battery was in backward in the VW. It started and ran as if nothing was wrong. I asked a mechanic that owned a Alternator/starter shop and explained that if it was permanent magnet starter it would turn backward. But a field coil current starter will still run the right way to start the engine. The old point systems could run on reversed voltage but it reduced the spark output by about 30 % when the coil was hooked backward. If it is a newer bike with electronic ignition then it would probably ruin something. I would never believed it either if I didn't work on that old VW.
Older Jags were positive-ground & a haven for batteries installed backwards (because who grounds the + side?). It's only backwards if you think it's backwards. Which it is. Backwards.

In this case, @Phil , something else has happened in between. A battery cannot go from +12V to -12V without crossing 0, and at 0 *something* has to continue putting energy into the battery to give it a reverse polarity. Scary stuff, but it doesn't just happen over the course of a few days.



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post #14 of 23 (permalink) Old 07-04-2016, 01:26 PM Thread Starter
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In this case, @Phil , something else has happened in between. A battery cannot go from +12V to -12V without crossing 0, and at 0 *something* has to continue putting energy into the battery to give it a reverse polarity. Scary stuff, but it doesn't just happen over the course of a few days.

From the time I last rode it to the no start incident (which was just over a week) the battery was on a Battery Tender the whole time.
Maybe the Tender is bad and caused the battery problem. But remember, the battery is about 7-years old. That's a good long life for a motorcycle battery.
Not sure how to determine if the charger is bad......
Phil



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post #15 of 23 (permalink) Old 07-04-2016, 01:31 PM Thread Starter
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I have a friend that has a charger like that. it will tell you the "Reverse Polarity." or similar to it. What it is telling you is you have the cables reversed. Pos on neg cable

The battery was out of the bike sitting on a bench. The charger spit out a code for reverse polarity, cables were not reversed. Red to positive, black to negative. It's not rocket science!
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post #16 of 23 (permalink) Old 07-04-2016, 01:56 PM
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Throw that POS battery in the recycle and get a good one.
To check your charger put it on your car battery to see the charging voltage. And you can run some jumper wires from your car battery to the bike cables to eliminate the battery and see if you can get is started. Then all the questions will be answered.

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #17 of 23 (permalink) Old 07-04-2016, 04:29 PM Thread Starter
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Throw that POS battery in the recycle and get a good one.

lol!
POS? I got 7 good years out of that battery....... I think I paid $69.99 for it in 2009; that breaks down to less than $10 a year.
I hope nobody calls me a POS when my time is up.

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post #18 of 23 (permalink) Old 07-04-2016, 06:02 PM
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lol!
POS? I got 7 good years out of that battery....... I think I paid $69.99 for it in 2009; that breaks down to less than $10 a year.
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True, but then it turned on you just like that....

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post #19 of 23 (permalink) Old 07-04-2016, 06:10 PM Thread Starter
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True, but then it turned on you just like that....
Yeah, but I've also had good women turn on me too........ it's the way life is sometimes! Ya' gotta' take the bad with the good!

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post #20 of 23 (permalink) Old 07-05-2016, 12:58 PM
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If you are going to buy a new battery consider this one. Sealed unit.. I HATE lead acid batteries!

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

A bit more expensive. It's said not to fit the Shadow ACE 1100 but it fits perfectly if all the little rubber bumpers are removed inside the battery cage.

K


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