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| Joined: | 03-12-2005 |
| Location: | Kingman, Arizona USA |
| Posts: | 532 |
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Inside the thing is a copper(?) plated disk that mounts to the end of the iron shaft that moves when the solenoid is energized. This disk makes electrical contact with (a) the inner end of the stud for the main battery cable, (b) the inner end of the stud for the strap from the starter motor, and (c) the inner end of the blade connector that ends up being wired to the junction of ballast and coil. If the solenoid doesn't energize, or if the plating on the disk has burned away due to use, that would cause the problem you describe.
I suppose the solenoid would in theory be repairable, but it's much easier to buy a new one. AFAIK there's nothing even remotely special about the part, so you should be able to get one from any of the usual sources. If not, then I'd think that a solenoid from any car with a Lucas negative-ground starter would be likely to fit and work.