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12V conversion--boiling battery

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Clyde557NC

09-02-2007 18:27:12

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1951 8n side mount distributor; I converted to 12 volt using a conversion kit purchased from this site and followed the conversion instructions that came with it (they also matched diagrams and instructions on this forum). Cranks, runs, and charges good. I even like the idiot light that lights with the key and goes out with charging. When running the original ampmeter pegs over to full charging (30+). The problem is that the last two times I have used it (temp. 90+ degrees F both times) finish mowing (running about 1600-1800rpm) I smell sulphur fumes and find the battery boiling. I have a temp guage that stays normal range and can put my hand on the back of the block near the battery and it doesn't feel overly hot,etc. What's wrong? Is it overcharging or overheating from this really hot weather. The battery is still cranking the tractor really strong. I don't want to be in a dangerous situation.
Clyde557

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Clyde557NC

09-02-2007 19:35:45

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Re: 12V conversion--boiling battery in reply to Clyde557NC, 09-02-2007 18:27:12

Thanks to both of you guys. I will check it out next time I use it.
Clyde557

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Bob

09-02-2007 18:37:09

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Re: 12V conversion--boiling battery in reply to Clyde557NC, 09-02-2007 18:27:12

You NEED to check the voltage at the battery, while it's charging.

Up to 14.5 or 14.75 Volts at the battery, the regulator is doing it's job. If the voltage is HIGHER, you have a voltage regulation problem.

NOTE... A bad (sulphated) battery will boil and stink, even at normal voltage.

If the voltage IS high, check to be sure Terminal #2 on the alternator is "seeing" battery voltage, either from being jumpered over to the alternator's large output stud (as shown in the photo below) OR wired all the way back to the battery side of the starter solenouid for voltage sensing closer to the battery.

Third Party Image

(You do NOT need the diode shown in the photo, 'cause you have an "idiot light" instead.)

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Clyde557NC

09-02-2007 18:46:54

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Re: 12V conversion--boiling battery in reply to Bob, 09-02-2007 18:37:09

Thanks Bob
I used your picture to wire the alternator exactly like this picture you posted when I did the conversion. Everything appeared to be working right. I have not measured the voltage but will next time I use it. If the voltage is higher than 14.75, then what? So is voltage all I need to measure? Do the amount of amps matter? Doesn't the alternator have an internal voltage regulator? If so, then I need a replacement alternator?

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Bob

09-02-2007 18:55:16

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Re: 12V conversion--boiling battery in reply to Clyde557NC, 09-02-2007 18:46:54

IF the battery voltage is not too high, but the ammeter is still showing a heavy charge AND the battery is boiling and "gassing", you can bet the battery is "bad", having a shorted cell or two, making the remaining good cells get overcharged.

If the voltage at the battery is too high, the alternator's internal regulator is "bad" (assuming, of course that the wiring is correct to it's "voltage sense" terminal).

The internal regulators can be had for less than $10.00, but tearing into an alternator is a bit scarey for those who haven't done it before.

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old

09-02-2007 18:50:57

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Re: 12V conversion--boiling battery in reply to Clyde557NC, 09-02-2007 18:46:54

Yep internal VR on them. Yes if its putting out more then the 14.75 you have a problem with the alternator. Even new one can be bad, common now days with the lack of good help/qualty contorl in some places

Hobby farm

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