too much juice

[SteveR(OH)]

I bought a tractor that had been converted to 12v, and it started to overcharge the battery.

I was advised the single wire generator has a built in regulator and that was the issue, so I replaced it. Same. Still pegs the volt meter over 14 volts. Cooked a battery

Was told to run a ground wire from generator housing to the block, and did that. Same.

Took the generator back to NAPA to have it tested and it tested good. Put it back on.

Ran jumper cable from generator housing directly to the battery. Same

Any suggestions?

 

[HCooke]

"Still pegs the volt meter over 14 volts"

Should be about 14.8 volts when running.

 

[greywolf224]

(reply to post at 15:07:03 04/21/15)

Seems like you have an out of ordinary setup if you are running a 12 volt generator.
What exact tractor did you buy?

How is your charging system exactly wired up?
What kind of 12volt generator are you running? Usually they are 6 volt setups with a generator and external voltage reg or a 12 volt setup with an alternator and internal regulator.

As has been said a 12 volt battery shows ~14.8 when being charged.

 

[souNdguy]

Let's be clear..

Single wire generator? Or alternator? Makes a huge difference.

Generators on fords do not have built in regs.

A 1 or 3 wire gm 10si will have a built in reg.

If it is a true 1 wire, then once charging and at over 400 rpm, I'd expect 14.4 v, though there are small variations depending on the very used.

What does a good com tell you across the battery , static, and then when charging at startup, and then when charging after running 10 minutes.

 

[Jock(OR)]

I had a similar problem with an old Ford pickup that had been converted to a Delco 12V alternator. It was a
"One Wire" alternator, with no voltage regulator. It overcharged the battery and also burned up the
alternator. After the second alternator failure, I quizzed NAPA on warranty. After checking the part number,
they wanted to see the "voltage regulator" from the truck. It turns out that Delco made a 10SI alternator that
had no internal voltage regulator, and if no regulator was installed in the control wires, it would put out
full charge amps all the time.

This type of 10SI looks just like a "One Wire" version, including having the same hook-up terminals, and a
"dummy" voltage regulator where the internal regulator would be!

 

[greywolf224]

A true DELCO REMY 10SI (SI standing for systems Integrated Regulator) will have an internal regulator. I believe Delco makes some without the regulator but they will not have the SI designation.
Maybe after rebuild your SI alternator was not built with the internal regulator.???

Many other after market also and who knows what you get.

 

[greywolf224]

Steve email me and I can send you some good reading on Delco Alts.
[email protected]

 

[souNdguy]

A 10dn has no internal reg..

 

[tractorguy2]

Sure you have a volt meter and not an amp meter?

 

[SteveR(OH)]

(quoted from post at 04:00:48 04/22/15) Sure you have a volt meter and not an amp meter?

I'm sure its a voltmeter.
This is on a jubilee, by the way. I have seen conversion kits where there is an external resistor as part of the kit. I am not sure I see that on my tractor (although I need to look again).

Anybody have opinion on the necessity of such a resistor?

 

[SteveR(OH)]

[email protected]

 

[SteveR(OH)]

I need to borrow the multi meter again and see. I sort of recall it being around 16 V.

 

[greywolf224]

sent