All,
Well, looks like the solenoid coil is toast. Pulled unit from housing and
tested with ignition on, in fouth gear and switch thrown. No valve movement
at all. I did get a small spark when touching coil outer case body to the
gearbox to ground it so I know I have power to it.
Mike
'79B
----- Original Message -----
From: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>
To: <MG-MGB@yahoogroups.com>; "MG-BBS" <mgs@autox.team.net>
Sent: Friday, September 03, 2004 3:47 AM
Subject: Re: [MG-MGB] OD Trans Failure
The quickest way to check the electrics of the solenoid is to check that
current is flowing in the circuit when it should, unfortunately just
checking for voltage doesn't eliminate breaks in the circuit between the
gearbox switch and through the solenoid. Locate the connector where the OD
wire in the main harness joins its partner in the gearbox loom, this will be
amongst the mass of connectors near the fusebox or on the firewall near the
heater. On cars with a dash or column manual switch there will be a yellow
in the main harness and a yellow/red in the gearbox harness. In cars with a
gear-lever manual switch, on UK cars it will be a 4-way bullet connector
with white/browns in the main harness and a white or white/brown in the
gearbox harness. On North American cars there is a white from the inertia
switch to a 4-way bullet connector which may or may not be in the main
harness, then whites or white/browns from there one into the gearbox harness
for the OD and one into the rear harness for the fuel pump.
Having found your connector ... part it and connect a test-lamp in its
place. With the ignition and manual switches on, and the gearbox in an OD
gear, the lamp should light. With all other combinations the light should
be off. You can use an ammeter, both my LH solenoids measure about 180 ohms
which gives about 70mA.
The above relates to the later LH-type OD, I don't know the details of the
D-type. It has an additional relay and vacuum switch and it is the relay
that supplies current to the solenoid, the manual switch just operates the
relay. However with the engine off but the ignition on you reputedly can
hear the D-type relay *and* the solenoid clicking as you operate the manual
switch, but not on the LH-type.
PaulH.
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