I thought something similar - but it is a two part question. As I
understand it the whole circuit is configured similar to a "Y" with the
base going to ground. What the two questions ask are which side is the
fault. If neither is at fault then the problem is isolated in the
switches (ouch - isolator switches - no pun meant). Then check to see
if the switches are set up in the correct order and properly or if they
function at all.
My 2cw...
Carl
> -----Original Message-----
> From: Andrew Dixon [SMTP:adixon@loudoun.com]
> Sent: Thursday, April 23, 1998 12:44 PM
> To: triumphs@autox.team.net
> Cc: 'Gernot Vonhoegen'
> Subject: RE: od again - long response
>
>
> Carl,
> I realize this came from a manual but unless I'm reading this wrong,
> this is
> the same condition as when the steering column switch is on. The
> contacts
> are just electrically stuck. This provides potential but until one of
> the
> isolator switches is closed there is no path to ground, therefore no
> current
> flow through the solenoid, therefore no engaged solenoid. As the
> manual
> section reads to me, you'd have OD in all gears whenever you turned
> the
> switch on.
> Andy
>
> On 04/23/98 09:04 AM Musson, Carl said...
> >
> >>From the service manual for Overdrive Unit with Electrical Control
> (Pub
> >#502274) p.7
> >
> >a) Built into the relay are switch contacts which switch the current
> to
> >the solenoid when the coil is energized. Should these contacts stick
> >"IN" then the od would be operative on all gears including reverse.
> >
> >To Check: Remove wire from hot feed (probably starter solenoid
> >switch/white) to operating switch. Check the relay contact [c2] on
> the
> >overdrive relay on the solenoid side. If it is "alive" then the
> >contacts are sticking.
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