[AT] Case VAH: Cut-out relay?

Dean Vinson dean at vinsonfarm.net
Sun Nov 26 08:42:31 PST 2006


Thanks, Bigdog.  Good explanation.  Next time I go up to the farm I'll turn
the battery *and* the relay around.

Dean Vinson
Dayton, Ohio
www.vinsonfarm.net

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of DBigdog
Sent: Sunday, November 26, 2006 10:23 AM
To: Antique tractor email discussion group
Subject: Re: [AT] Case VAH: Cut-out relay?

Dean,
    The cut-out relay is simply a device to prevent draining the battery. 
If generator output voltage is lower than battery voltage, the relay opens
preventing back-feeding and discharging the battery.  When generator output
voltage is higher than battery voltage, the relay closes allowing the
generator to charge the battery.
    From your picture, the cutout you have most likely is a solid state
replacement using a diode to accomplish the same thing.  If that is the
case, reversing the polarity would indeed present a problem.


----- Original Message -----
Only thing I can think of is the cut-out relay on the generator.  I assume
that's what it is, although it's not the original one that was on the
tractor before.  The printed label on it is torn and I can't read it all,
but it says "POS GND" at the top and "NEG GND" at the bottom, so I figure it
can be wired for either one but needs to be the correct one.  See picture at
http://www.vinsonfarm.net/photos/VAH_relay.jpg.






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