Both of my two Farmall tractors have 6V, positive ground, 4-wire voltage regulators (VR). The Cub's VR works great...it provides a low rate of positive charging without the lights on and steps up to net positive charging with the lights on. The Super A's VR provides a low rate of positive charging without the lights on but, with lights on, the ammeter indicates a low rate of discharge. Can you direct me with how to apply adjustments to the Super A's VR charging relay (not the "cut-out" portion of the VR device) so I can get the Super A charging when the lights are on? I have a multi-meter, jumpers and have read a lot about these devices but still am not skilled at tweaking them to get proper performance on the machine. I have had the generator and VR checked remote from the tractor and deemed healthy with the output set at 7 VDC.
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6V, Pos-grnd, 4-wire Voltage Reg Adjustment
- Thread starter Ironlegs
- Start date
John,
My Cub goes slightly to discharge with the lights on, but if I give it more throttle, it goes to about the middle-not charging, not discharging. I've never had the battery go down on me, and I checked it with a multi meter, and it charges 2 amps with the lights on, mid throttle.
My Cub goes slightly to discharge with the lights on, but if I give it more throttle, it goes to about the middle-not charging, not discharging. I've never had the battery go down on me, and I checked it with a multi meter, and it charges 2 amps with the lights on, mid throttle.
My FCub gives about 2 amps with the lights on and at working RPM. The Super A discharges about 2 amps with the same conditions. The generators on both will only make enough juice for charging when they're at operating speed (1500 RPM or so). At idle, generator speed is too low for charging. The Super A needs adjustment but I do not know how to do it without risk.
http://www.cleancomputes.com/Cub/Blue%2 ... trical.htm
Page 40 in above link discusses voltage and amperage regulation.
Actually, there could be a myriad of problems indicating low or negative amperage charging rate with lights on. Some 6 volt generator/regulator set ups are only capable of 9 - 11 amps, maximum. Next problem is that you need to know exactly, which generator and regulator you have.
First thing to do is figure out the amp draw of the entire electrical circuit with lights on. Then take the generator and regulator back to the shop and see if the current set up is capable of producing a couple more amps than is required.
Page 40 in above link discusses voltage and amperage regulation.
Actually, there could be a myriad of problems indicating low or negative amperage charging rate with lights on. Some 6 volt generator/regulator set ups are only capable of 9 - 11 amps, maximum. Next problem is that you need to know exactly, which generator and regulator you have.
First thing to do is figure out the amp draw of the entire electrical circuit with lights on. Then take the generator and regulator back to the shop and see if the current set up is capable of producing a couple more amps than is required.
Marion(57 Loboy)
501 Club
I suggest going over the A's wiring, and refreshing each and every contact and connection/splice.
Gerry Powell
Well-known member
John,
you can adjust the regulator coil output but you need to have a voltmeter and ammeter connected so you can see what the effect of the adjustment is. Try to find an old generator tester that has both functions in one meter. This meter has a good feature to look for, the current scale that will read downscale also so you can measure the discharge without pegging the meter to the left when the generator isn't outputting a current but it doesn't have the set zones on the voltage scales which is handy to have for quick visual when adjusting. On the rear of the coil is a spring connected between two hooks, one fixed to the regulator frame and the other to the top plate that has the upper contact point. By gently bending the lower hook you can increase/decrease the spring tension which adjusts the output. But be careful, it only takes a little tweak to change it. Watch the meters to see the effect, you don't want to set the voltage much over 7 to get more current. Look at the meter I linked to above and see it's set zone for a 6 volt system is 7-7.6v. It's kind of a fine touch that you have to feel comfortable doing. It's pretty much a lost art since generators have been replaced by alternators.
you can adjust the regulator coil output but you need to have a voltmeter and ammeter connected so you can see what the effect of the adjustment is. Try to find an old generator tester that has both functions in one meter. This meter has a good feature to look for, the current scale that will read downscale also so you can measure the discharge without pegging the meter to the left when the generator isn't outputting a current but it doesn't have the set zones on the voltage scales which is handy to have for quick visual when adjusting. On the rear of the coil is a spring connected between two hooks, one fixed to the regulator frame and the other to the top plate that has the upper contact point. By gently bending the lower hook you can increase/decrease the spring tension which adjusts the output. But be careful, it only takes a little tweak to change it. Watch the meters to see the effect, you don't want to set the voltage much over 7 to get more current. Look at the meter I linked to above and see it's set zone for a 6 volt system is 7-7.6v. It's kind of a fine touch that you have to feel comfortable doing. It's pretty much a lost art since generators have been replaced by alternators.