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Old 03-12-2013, 06:44 AM   #1
Dimadee
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Default Can a faulty ignition switch cause a starter to stick?

I am having a problem with my 1960 Cadillac Eldorado Brougham, and hope to get some insight from my fellow HAMBers

I have only recently purchased this vehicle, and it is in with the mechanic being made ready for a roadworthy. The front suspension rubbers and ball joints have all been replaced (ball joints were the originals!), as well as the rear control arm bushes, which were barely there.

Anyway, on a number of occasions I have started the engine and the starter has not disengaged after starting. I can switch the ignition off and take the key out, however the starter continues to crank over. This is not good! The only way to stop it is to disconnect the battery.

One of these occurrences totally fried the starter motor so I sourced a reconditioned unit and had it fitted. Speaking to the mechanic today, the starter is still not disengaging sometimes.

My question is how likely is it for the ignition switch to be causing this? I can get another ignition switch, but just wanted to check if this is a realistic potential solution.
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Old 03-12-2013, 06:55 AM   #2
31Vicky with a hemi
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Default Re: Can a faulty ignition switch cause a starter to stick?

Yes that's a possibility.
I would disconnect the starter activation wire and use a test light to check it out.
The ignition switch should kill power to everything In the off position including that wire.
Faulty ignition switches cause lots of trouble
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Last edited by 31Vicky with a hemi; 03-12-2013 at 07:01 AM.
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Old 03-12-2013, 07:06 AM   #3
R Pope
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Default Re: Can a faulty ignition switch cause a starter to stick?

Could be the switch, all right. Try hooking up a separate switch, like the ones used to bump the starter when tuning. If it doesn't stick with this switch, you know what's wrong. A Caddy switch might be hard to find, so you could always put a push-button switch under the dash for starting it.
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Old 03-12-2013, 07:16 AM   #4
porknbeaner
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Default Re: Can a faulty ignition switch cause a starter to stick?

Quote:
Originally Posted by 31Vicky with a hemi View Post
Yes that's a possibility.
I would disconnect the starter activation wire and use a test light to check it out.
The ignition switch should kill power to everything In the off position including that wire.
Faulty ignition switches cause lots of trouble
Not disagreeing with 31Vicky here but another option and one that is common is a bad starter solenoid. Sometimes they stick.

Did the different starter motor come with a different solenoid or did you use the same one?
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Old 03-12-2013, 07:47 AM   #5
Rusty O'Toole
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Default Re: Can a faulty ignition switch cause a starter to stick?

The test light suggestion is a good one. Add it to the key switch circuit and tape it to the dash. When the starter sticks, if the light is on, it's the switch. If the light goes off, it's the solenoid.

I would add a wire to the switch terminal of the solenoid, to a bulb, then to ground.
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Old 03-12-2013, 08:11 AM   #6
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Default Re: Can a faulty ignition switch cause a starter to stick?

All of the above. Did you change the solenoid when you changed the motor? If so then I would say it is most likely the switch.
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Old 03-12-2013, 08:17 AM   #7
PKap
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Default

If it is not the switch( first choice to check) I would see if the starter is too tight. If the p.o. changed it without replacing shims, and the flywheel has some rough teeth, it can grab the starter gear and not let it go.


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Old 03-12-2013, 08:18 AM   #8
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Default Re: Can a faulty ignition switch cause a starter to stick?

I would check the solenoid. HRP
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Old 03-12-2013, 09:18 AM   #9
lanny haas
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Default Re: Can a faulty ignition switch cause a starter to stick?

I go for the switch if it keeps trunning over AFTER the key is turned off....it is still getting power to the starter from the switch even after it is off. I think a contact is loose in the switch. those can be taken apart if you know what your doing.
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Old 03-12-2013, 10:54 AM   #10
31Vicky with a hemi
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Default Re: Can a faulty ignition switch cause a starter to stick?

Funny thing here is the battery needs disconnected to stop it.
Still the only place you have to start with is a test light on the starter activation wire.
That may /should lead you up the path to the problem.

Or you could throw $ and parts at it
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Old 03-12-2013, 12:48 PM   #11
big M
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Default Re: Can a faulty ignition switch cause a starter to stick?

Often times it is the solenoid, the copper contact disc inside gets worn and willl stick in the bore of the solenoid. a light tap on the side of the solenoid with a hammer will often free it up temporarily. The ignition switch can also cause the same problem, if the crimp between the bakelite and potmetal portion comes loose, allowing the springs or contacts to come loose and create a new circuit.

---John
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Old 03-12-2013, 02:47 PM   #12
black 62
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Default Re: Can a faulty ignition switch cause a starter to stick?

disconnect the red wire to the switch ---worked for me...
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Old 03-12-2013, 04:03 PM   #13
Nads
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Default Re: Can a faulty ignition switch cause a starter to stick?

Oh man, I have wanted one of these cars for a very long time, would you be interested in selling it?
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Old 03-12-2013, 04:26 PM   #14
Chrisbcritter
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Default Re: Can a faulty ignition switch cause a starter to stick?

My ex-boss's '56 DeSoto has this problem - and the guy who used to detail it told me it only happened when the battery was low; if it was fully charged it wouldn't do it. Does that narrow it down?

So where did you find this Brougham?
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Old 03-13-2013, 05:29 AM   #15
Dimadee
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Default Re: Can a faulty ignition switch cause a starter to stick?

Thanks all for your replies. I really appreciate you taking the time to respond. The light globe sounds like an excellent idea as it will tell me if the switch is the source. I wouldn't have thought of that straight away, so thanks for eliminating some frustration!

I bought the reconditioned starter from UCP Auto Parts on eBay. It was the only place I could find a reconditioned unit quickly. It came fully assembled with a solenoid attached. The fact that the first starter did the same thing makes me think that the switch may be the culprit.

You may not have noticed that I am in Melbourne, Australia. I bought the Brougham from a guy up in Queensland and shipped it down to Melbourne. It is build number 70, and from what I can find out, it is the only 1960 Brougham in Australia. There are a number of things that are not right with it (i.e. the tri power has been swapped for a 4 barrel), but it is still a Brougham!

Quote:
Oh man, I have wanted one of these cars for a very long time, would you be interested in selling it?
I have only had it for a short time, but everything has a price. Nads, if you are serious, please PM me.
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Old 03-13-2013, 07:45 AM   #16
Nads
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Default Re: Can a faulty ignition switch cause a starter to stick?

There are two more 1960 Eldo Broughams in Australia both in very, very rough condition.
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