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JD 40 battery discharging

3

36 Coupe

Well-known Member
This message is a reply to an archived post by El Toro on October 23, 2012 at 07:38:36.
The original subject was "Re: JD 40 battery discharging".

Ive worked on military trucks, they dont have ignition keys for obvious reasons.We had a military fire truck that had a slow discharge problem.It had a dash voltmeter that was on full time.I put a push button switch beside the meter to disconnect the meter.The truck had a battery shut off switch but we couldnt use it because most drivers didnt know how to use it.It took a long time for the meter to pull the batteries down.A good quality battery switch will cost more than a cutout or new vr.
 
Most of the tracklaying military vehicles had this type master switch. They're probably using something different now. Hal
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FWIW a good dash voltmeter draws only about 0.012 amps (12 volts into 1,000 ohms). Means it would take several THOUSAND hours for a continuously-connected voltmeter to draw down a fully-charged battery.

Gotta believe there was something else connected in parallel with the voltmeter on that fire truck - like the meter's internal illuminating lamp. (I've seen it happen...)
 
Didn't that tractor have a generator? If so, could the voltage regulator have a defect which would fail to shut off when tractor not running?
 
That truck was used for grass and woods fires so it spent much time idle.Switching the meter fixed the problem.A trunk light kept on by a faulty switch can run a battery low in 2 days.Car wasnt bothered in daily use but parking friday pm till monday morning the car needed a boost to start.
 
Voltage regulators dont seem to have sticking cutout relays like plain cutouts did.I worked for a JD dealer when the 40 was a new tractor.
 
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