List,
I thought, since the overdrive works intermittently, that we were looking
for a break in the circuit. The light bulb will certainly detect that. It
will also check the operation of the interrupter switch and the column
switch. In the first instance, without crawling under the car. If an ammeter
is available to use instead of the light bulb, so much the better; but how
many of us have one of those in the tool box?
In my particular case, I'd already crawled under the car and measured 12V at
the solenoid. I used the light bulb to prove that it was drawing current. I
felt the ground path of the solenoid through an oily film was suspect.
Proving that the solenoid was drawing current led me in another direction:
the removal of the bottom plate and the plug beneath the oil pump and,
therefore, the discovery of the missing ball on the anti return valve.
But the problem almost certainly is low oil pressure anyway.
Ed Woods
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