I have a 1987 wh 414-8 with a kohler 14hp magnum 3 amp unregulated charging system that after a couple minutes of running starts to put out 15-17 volts replaced diode and checked batt with hyrometer all is good worked good for 2-3 times after replacing diode but back to square one can anyone help?
- Thread starter ed carik
- Start date
Disconnect dc output of alt from ign sw,battery or tractor wiring harness whichever is easiest,run eng at 3000 rpm/more,check DC voltage output from alt,if voltage 28v/more then nothing wrong with charging system.
The inherent problem with an unregulated system is battery is being constantly charged/overcharged reduceing battery life as this system uses the internal resistance of battery as a regulator with time,overchargeing & vibration cells in battery start to breakdown & internal resistance of battery changes along with reserve/ah capacity of battery,while a hydrometer may tell you battery has a full charge actual reserve/ah of battery may be low & voltage on charging system rises trying to maintain a weak battery,15-17v on an unregulated system is normal when a battery is going down hill/reaching the end of it's life.Remove battery & have load checked.I have a wh charger 12 with a 3A unregulated system & this tractor is hard on batteries compared to my other 3 tractors with 10/15A charging systems & a regulator.
The inherent problem with an unregulated system is battery is being constantly charged/overcharged reduceing battery life as this system uses the internal resistance of battery as a regulator with time,overchargeing & vibration cells in battery start to breakdown & internal resistance of battery changes along with reserve/ah capacity of battery,while a hydrometer may tell you battery has a full charge actual reserve/ah of battery may be low & voltage on charging system rises trying to maintain a weak battery,15-17v on an unregulated system is normal when a battery is going down hill/reaching the end of it's life.Remove battery & have load checked.I have a wh charger 12 with a 3A unregulated system & this tractor is hard on batteries compared to my other 3 tractors with 10/15A charging systems & a regulator.
Batteries on lawn tractors exploding are rare but like any other battery are not unheard of,most likely cause of same would be loose/bad internal cell connectors or internal connections to battery posts causeing a spark & firing off hydrogen gas generated while charging a battery(the poorer the condition of battery the more gas generated),most batteries(lead/acid) have enough venting on cell caps to prevent excessive gas buildup in each cell,worst case situation would be if you continue to flog a weak/bad battery is you could burn out diode or damage alt stator.
steve_in_mo
Well-known Member
If your stator is putting out better than 38 volts DC (use a multimeter) and your battery is in decent shape, you could probably eliminate the diode and use the voltage regulator from a 10 or 15 amp system.
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