Re: (ET) Befuddled! PTO dash switch - more data

["Max Hall" <maxo iname com>]

Ach! So one of the things must be a precharge capacitor or something for
latching the state of the PTO contactors, hey? It seems if you touch all
three together then take the third (the one which would be isolated in the
DPST switch when in the "on" position) it stays on.

- Max Hall
- www.maxmatic.com
- Share the road.


----- Original Message -----
From: Max Hall <maxo iname com>
To: Elec-trak <elec-trak cosmos phy tufts edu>
Sent: Saturday, March 03, 2001 4:58 PM
Subject: (ET) Befuddled! PTO dash switch


> Hi team. We are bracing for a good whumpin' up here in the nor'east, so I
> went out to check on the ET (a 15 with a snowthrower; see also
> http://www.maxmatic.com/electrak.htm ) and found the PTO was not working.
I
> opened the dash up (from both sides) and cleaned out all kinds of
detritus,
> including an old mouse house!) and finally tracked it down, I think, to
the
> switch.
>
> There's beffudlement, though: the PTO switch seems to be a vanilla DPST,
but
> I can only make the PTO contactors close if I connect *all three* of the
> wires (each of which had its own spade lug on the back of the DPST 
> switch)
> together! What's the role of the third wire? Safety circuit?
>
> Thanks to anyone who can shed some light... the snow... it's... it's...
> (WHUMP!)
>
> - Max Hall
> - www.maxmatic.com
> - Share the road.
>
>
>
>