At the risk of sounding like a broken record, check the ground on the
starter.
I had a similar problem with the GT. Every time it failed to start
(either from your #2 or #3), I'd take the starter off, bench test it
(fine each time), re-installed it worked perfectly for a few days or a
couple of weeks even.
Finally ran a ground strap from the upper mounting bolt to the frame.
Haven't had a start failure in over a year now.
YMMV
Rick Morrison
72 MGBGT
74 Midget
On Thu, 02 Apr 1998 14:15:16 -0500 (EST) "M.P. Trebelhorn"
<mpt3265@osfmail.isc.rit.edu> writes:
>Okay, here's the situation:
>
>'70 MGB, intermittent starter failure.
>Twisting the key will always trip the relay, which will *not* always
>engage the
>solenoid. Three basic modes:
>
>1 (95% of the time) Turn the key, starter works, car starts.
>2 (4.5% of the time) Turn the key, relay clicks, nothing else.
>3.(remaining .5%) Turn the key, starter spins, but does not engage.
>
>1 and 3 can take place on subsequent key-twists. 1 and 2 (or 2 and 1)
>
>have been happening on opposite ends of a drive or mechanical work.
>(push it
>started and drive home, when I get there it works again; or, for
>example, pull
>the starter, bench test, re-install, and it works again. For a
>while.)
>
>This is a bit unnerving (esp. #3). Any thoughts/suggestions?
>
>The starter is less than six months old, 5k miles ago (3 months) the
>flywheel
>was inspected and was not missing any teeth, the car has no other
>electrical
>problems (touch wood).
>
>
>Matt
>
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