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Farmall & IHC Tractors Discussion Forum

cutout vs VR

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flashback

09-20-2007 13:51:55

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What is the difference between the 6V cout out and a 6 V voltage regulator and how is the wiring different. Have a 6 volt VR to replace a cutout. 6V pos grnd.

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John T

09-20-2007 18:14:29

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Re: cutout vs VR in reply to flashback, 09-20-2007 13:51:55

Id be glad to use the VR instead of the old cutout cuz it automatically sets the correct charge rate as opposed to you manually using Low or High Charge on the light switch.

On the old cutour relay the gennys Field post wired to the light switch but you no longer use that connection with a VR, it wires as follows if its a 3 terminal (BAT ARM FLD)

BAT on VR to ammeters Load terminal, thats the same wire that used to wire to BAT on the relay FLD on VR to gennys Field post instead of up to the light switch with a relay.

ARM on VR to gennys ARM post

If its a 4 terminal VR with the extra 4th L terminal, that terminal now feeds hot battery voltage to lights n ignition instead of them being fed off the ammeters load terminal as with only a relay or a 3 terminal VR

If its a 3 brush genny Id set it for max charge rate. Polarize the genny prior to start up.

John T

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Janicholson

09-20-2007 17:10:23

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Re: cutout vs VR in reply to flashback, 09-20-2007 13:51:55

These are the best there are. JimN

Bob M diagrams

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Mike CA

09-20-2007 14:45:41

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Re: cutout vs VR in reply to flashback, 09-20-2007 13:51:55

[quote:09fe9d4c95]A cutout relay lets current flow from the generator to the battery but prevents it from going the other way, so you can charge the battery up but it won't just drain back down through the generator. The tractor operator controls the charging rate with the light switch, which has four positions: High, Low, Dim, and Bright. If the lights are on (Dim or Bright), the generator charges the battery at the high rate. If the lights are off, the generator charges at either the high or low rate depending on the switch position. Too little charging and the battery will run down; too much and the battery can be damaged. An automatic voltage regulator has the same basic job as the cutout relay, letting current flow from the battery to the generator but not the other way around, but it also solves the under- or over-charging problem. It lets current flow from the generator to the battery whenever the battery voltage is lower than it ought to be, but then stops as soon as the battery is charged back up.

With a regulator there's no need for the operator to manually control the charging rate, so the wiring between the switch and the regulator is a little different than it would be for a cutout relay. And there's no need for the High and Low positions on the light switch. (On tractors that came equipped from the factory with a voltage regulator, the switch was truly just a light switch, and had only three positions: Off, Dim, and Bright).[/quote:09fe9d4c95]

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Hope this helps!!

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