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Ammeter Suddenly Shows Charging


 
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F4RM@11
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Joined: 22 May 2012
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Location: Ohio

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PostPosted: Sat Nov 17, 2012 2:35 pm    Post subject: Ammeter Suddenly Shows Charging Reply to specific post Reply with quote

After getting the SM started again following a carb rebuild, I turned to the electrical system to troubleshoot the lack of charging. The VR output had been adjusted and the gen inspected by an auto electric shop - both had a clean bill of health.

The ammeter showed a slight discharge with the ignition switch on and the needle didn't move with changes in engine speed. Following Bob's troubleshooting flow chart, I made it through to the last step before the ammeter began showing a charge.

When I jumpered the BAT and GEN terminals at the regulator, the ammeter suddenly began showing a charge and continued to do so afterward. The needle moved appropriately with engine speed.

I'm curious as to why a charge on the ammeter suddenly began to show after making this brief circuit. The battery was fully charged after I returned to the shop as the trickle charger indicated so.
 
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mkirsch
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PostPosted: Sat Nov 17, 2012 2:45 pm    Post subject: Re: Ammeter Suddenly Shows Charging Reply to specific post Reply with quote

Shut it down and start it up again. Does it still charge?

I had the same problem last year, and it was a bad regulator.
 
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F4RM@11
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PostPosted: Sat Nov 17, 2012 2:50 pm    Post subject: Re: Ammeter Suddenly Shows Charging Reply to specific post Reply with quote

mkirsch wrote:
(quoted from post at 15:45:36 11/17/12) Shut it down and start it up again. Does it still charge?

I had the same problem last year, and it was a bad regulator.


Yes, I had it shut down a few times today, one of which was for 30 mins or so. The ammeter continued to show a charge after each start. I'm not complaining - just curious to understand what happened.
 


Last edited by F4RM@11 on Sat Nov 17, 2012 4:29 pm; edited 1 time in total
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gbs
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PostPosted: Sat Nov 17, 2012 4:49 pm    Post subject: Re: Ammeter Suddenly Shows Charging Reply to specific post Reply with quote

you polarized the generator
 
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F4RM@11
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PostPosted: Sat Nov 17, 2012 5:11 pm    Post subject: Re: Ammeter Suddenly Shows Charging Reply to specific post Reply with quote


Embarassed I feel silly for not knowing that since it says right on Bob's troubleshooting flow chart. Duh! Thanks.
 
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Bob M
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PostPosted: Sat Nov 17, 2012 5:13 pm    Post subject: Re: Ammeter Suddenly Shows Charging Reply to specific post Reply with quote

Your generator was likely polarized backward; jumpering BAT and GEN terminals fixed that.

Could also however be an intermittant problem involving the regulator ground - especially if the regulator is in the stock location bolted on the front of the steering wheel stanchion. (The Super M is notorious for VR grounding problems here.)

Suggest running a #14 ground wire from the regulator base to a GOOD frame ground - ideally where the grounded battery cable is attached.
 


Last edited by Bob M on Sat Nov 17, 2012 5:18 pm; edited 1 time in total
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