I recently swaped the motor in my truck and used the bigger 100amp alt from the other truck along with the voltage regulator. now if I drive the truck more than 20 miles or so its starts boiling the acid out of the drivers side battery. the battery's are about 3 months old and nothing wrong with them. and both battery's are gettin charged. any idea's? thanks in advance.
I too have the same problem. I don't think I've boiled the battery, but I installed a 100 amp alternator, and my truck battery light kicks on like it is overcharging. I have to run the lights to keep the amps down.
Hope someone chimes in with the answer.
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THE BLUE BOMBER!
87 ford f-350 cab-chassis dually. 2wd, 6.9, 3 speed C-6. 3 leaf helper springs, 11,000 gvwr, pintle/ball hitch, 6 pin round trailer connector (unhooked currently). Rear generic truck stop lights. Twin I beam front end with coil springs. Plow lights and switch to go from headlights to plow lights. 8.5 foot meyer diamond plow with central hydrolics. 8 foot rugby dump bed. 167,000 miles and still strong.
I recently swaped the motor in my truck and used the bigger 100amp alt from the other truck along with the voltage regulator. now if I drive the truck more than 20 miles or so its starts boiling the acid out of the drivers side battery. the battery's are about 3 months old and nothing wrong with them. and both battery's are gettin charged. any idea's? thanks in advance.
Check the voltage with a good voltmeter. Running, the battery should have 12 to 14 volts, depending on the accessories being used.
Typical normal charge is 13. Absolute Maximum charge voltage is 16.
If the voltage is higher than this, suspect a bad regulator. This usually will effect BOTH batteries.
If the voltage is normal and only one battery is boiling fluid out -- that battery is bad (shorted cell) or is on its way out.
Having the same issue high volt issue and think I am going to replace my regulator. I bought one of those plug in your cigarette lighter volt meters at Wally World and saw 17 volts rather quickly this weekend. It pegs and says HIGH past that point. I put it in my dads 95 Ford Ranger to see what it would do and it stayed dead on 14 volts when running. Two vehicles later, and with them testing at 14 volts, too, I have to conclude my regulator is hosed.
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83 F250 Navistar 6.9, B-W T19 4 speed, aftermarket dually, slowly being morphed with my
84 F350 6.9 I bought for spare parts or rebuild
turns out it was a bad regulator and a corroded ground wire. it was runnin bout 19 volts or so before and after fixin those 2 things its back down around 14. thanks fer the help fellas.
going to bump this one back up here...i replaced the regulator, cleaned all the connections, still running 16 to 17.5 V after a few minutes run time...ideas?
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83 F250 Navistar 6.9, B-W T19 4 speed, aftermarket dually, slowly being morphed with my
84 F350 6.9 I bought for spare parts or rebuild
going to bump this one back up here...i replaced the regulator, cleaned all the connections, still running 16 to 17.5 V after a few minutes run time...ideas?
Check the connections to the regulator. Make sure all connections are clean and making good contact. Make sure there is a GOOD ground (frame) connection to the regulator.
Is the regulator the adjustable type (mechanical)? If so, you should be able to adjust the voltage down. to below 16V.
Unless one of the wires in the connector is a ground, or goes to a ground, the regulator (external metal case of the regulator) is not mounted to anything that would act as a ground. It is on a plastic part of the wheel well. It appears a wire could go on the far side (right hand side facing you) of the connector but my connector does not have a wire there. I will try to temporarily ground the metal case on the regulator and see what effect that has.
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83 F250 Navistar 6.9, B-W T19 4 speed, aftermarket dually, slowly being morphed with my
84 F350 6.9 I bought for spare parts or rebuild
It is not the battery that does overcharging, but it’s the alternator putting out to much fluid to the battery. An alternator can overcharge a car battery causing the battery to boil over.
This will occur when the rectifier is at fault. The rectifier wits the voltage/amperage in the battery and will act like a control to charge the battery. When this fails, mostly the alternator will overcharge the battery and the electrolyte evaporates.
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