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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Re: 6V Genny Now Overcharging

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Author  [Modern View]
JCinKY

03-05-2013 17:24:01
166.205.55.28



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Quoting Removed, click Modern View to see

'preciate all the good ideas. I'll get back on it tomorrow, ran out of dry wood to heat the shop.

The contacts weren't welded as of yesterday. VR is less than a year old with bolt on cap. Cleaned contacts when I was looking for charge. I'll have to make sure the resistor isn't grounded for sure. The rubber isolators looked in good nick so I think the case isn't grounded, but will have to double check with test light around mounting bolts.

I'll jump her tomorrow after work and let you know what I find.

Jeff

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soundguy

03-05-2013 17:39:32
108.112.252.220



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 Re: 6V Genny Now Overcharging in reply to JCinKY, 03-05-2013 17:24:01  
there's no reason your machine should be charging at 10v/20a for any length of time except for a few seconds after startup. if it continues doing that.. it's NOT normal.

initial high charge rate at startup is normal.. and it should taper off pretty quick.



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JMOR

03-05-2013 17:36:25
72.181.173.171



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 Re: 6V Genny Now Overcharging in reply to JCinKY, 03-05-2013 17:24:01  
" The rubber isolators looked in good nick so I think the case isn't grounded,"

WELL, IF IT IS NOT GROUNDED, then that is likely your problem!!!!



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soundguy

03-05-2013 17:42:14
108.112.252.220



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 Re: 6V Genny Now Overcharging in reply to JMOR, 03-05-2013 17:36:25  
i agree.. no ground reference or a floating / biased ground will for sure cause overcharging.



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JCinKY

03-05-2013 18:43:54
166.205.55.41



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 Re: 6V Genny Now Overcharging in reply to soundguy, 03-05-2013 17:42:14  
Quoting Removed, click Modern View to see

I guess I misunderstood or did not give thorough information. Gen is grounded to frame through the mount, ground stud is connected to vr case via harness to vr case.

The case is not bolted directly to chassis, via isolators. I took this to mean that I don't see how the vr resistor could be shorted to chassis ground unless the isolators were missing or broken down.

JMOR, I have used your front mount 6V diagram and referenced your pic from my other post. My vr did not have the oe tab, but the field circuit is connected to the case via the resistor. Thus grounded via harness and Gen ground?

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JMOR

03-05-2013 20:35:47
72.181.173.171



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 Re: 6V Genny Now Overcharging in reply to JCinKY, 03-05-2013 18:43:54  
Quoting Removed, click Modern View to seeThe VR case needs to be grounded. Maybe by a separate wire to generator case (that was Ford normal) & maybe to tractor chassis by a bolt, or perhaps both, but thee case must be grounded. Case is not grounded by way of a resistor.



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36 coupe

03-18-2013 04:36:43
69.49.142.155



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 Re: 6V Genny Now Overcharging in reply to JMOR, 03-05-2013 20:35:47  
Time for a hydrometer check on the battery plus a good cleaning of battery posts and cable terminals.a battery with a shorted cell will cause the generator to over charge.Back when a new battery was 30.00 I kept a new one on hand for trouble shooting.Ive found some odd problems in batteries that were solved by trying a new battery.My last 6v battery gave problems because the center cell read half charge while the other two read full charge.I had a 12v battery that would start my truck ok on a zero morning and just crank very slow when restarted 10 miles away.Took a new battery to fix that.Ive had many battery failures in summer.

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