Have 1970 Olds 442 - Started Car Today - Turn Switch to Off - Car Keeps Running - Have Changed Key Cylinder Lock & Ignition Switch - Still the Same Problem - Also While Running Pulled WirePlug @ top of alternator & Main Hot wire on Back of Alternator off thinking of Diodes inside - Still Have the Same Problem - Any Ideas??

 

Starter solenoid.

Wired wrong or stuck, connecting the coil to the battery (+) through the yellow wire.

- Eric

 

Starter is Inguageing & Releasing

 

X2. If you can find a used or get a new
starter this should fix the problem.
There is a short in either the starter or solenoid.

 

Not the starter. The relay contacts in the plastic end cap of the starter solenoid, or some error in its connections.

- Eric

 

i hope you pulled the 2-wire connector off before you pulled the output terminal wire, or you may now have bad diodes.

never disconnect an alternator output wire while the engine is running and the alternator still has a field supply.


bill

 

Yeah, there's a thin brass feeler strip on the resister bypass post of the solenoid that makes contact with the disk when the solenoid is engaged. I remember once finding one bent and shorted to the battery post. I think what happened is the post came loose and twisted around, bending the little feeler. Power to the coil all of the time.

You'll play heck trying to straighten it out properly. But there's a new one in a solenoid repair kit. …...... Except they quit selling repair kits back about.......Oh crap! I feel old.

If you have an old solenoid you might be able to take it apart and rob one. Otherwise you'll have to replace it.

 

What distributor do you have on there?

With the stock points style or some electronic style distributors, there are 2 wires, on the stock configuration? One from the starter, this is the resistor bypass wire, the other from the switch (or a resistor depending on previous mods), which should be a resistor wire. Seperate the 2 wires at the coil and see which one has the constant 12v, that will be where your problem lies.

If you have an HEI, there may only be 1 wire powered from the switch, and the one from the starter is no longer used. Or, back to the 2 wire setup connected at the cap. 1 from the starter for the start circuit, and 1 from the switch.