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Restoration & Repair Tips Board

Cutout Relay sticking

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John T

03-20-2012 17:30:45

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Okay if when you shut it down she draws a heavy discharge current, the cutout relay (inside of and a part of the Voltage Regulator between its ARM/GEN and BAT terminals) may be sticking closed, in fact if the belt were loosened the genny would sit there and run like the DC motor it is. That will discharge the battery plus make the genny hot. Its supposed to open when the tractor is shut down and close once the genny is turning and is producing sufficient voltage.

The tractor originally had a 4 (NOT 3) terminal Voltage Regulator with BAT LOAD FLD and GEN/ARM terminals with GEN/ARM off on one side or underneath all by itself. They wire:

BAT to load side of ammeter LOAD feeds hot battery voltage up to the light switch FLD wires to gennys FLD post ARM/GEN wires to gennys ARM post

If its really a 3 wire VR

BAT to load side of ammeter GEN/ARM to gennys ARM post FLD to gennys FLD post

On the older systems that used a simple 2 wire Cutout Relay (BAT and GEN) with no 3 or 4 terminal VR, the gennys FLD post wired to a Low/High Charge manual light switch which could be set for low or high charge. On the new systems with a VR the light switch controlled lights only but NOT charge rate.

If she cranks slow Id remove, clean and wire brush and re attach each and every battery and starter and ground cable and for 6 volt systems I prefer 0 better yet 00 Gauge cables for better cranking PLUS a high CCA heavy duty battery. Also a good ground to the frame versus a thin wimpy sheet metal seat box is better. CHECK THE GROUND CABLE AND THE REST OF THE BATTERY AND STARTER AND CABLES AND AT THE BATTERY

John T

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carl zuch

03-23-2012 05:42:06

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 Re: Cutout Relay sticking in reply to John T, 03-20-2012 17:30:45  
hello. the regulator on my late model b has 3 terminals evenly spaced apart. there is a resistor wired underneath it. my guess is to replace the light switch with the resistor built in it. inside the box are only two relays or cutout units. another question, to what terminal would i hook up the wire going to the light switch. it is in the same wiring harness as the wire for the ammeter. thanks again for your help

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