Starter woes...

[JCampbell]

’77 C30-454

Here’s the issue:

I go to start the truck a few weeks back and it turned over and started fine, but when I let go of the key, it kept turning over. It only did it for a few seconds.

Flash forward to last week. Went to start the truck and the same scenario happened only this time, the starter wouldn’t stop turning. I even pulled the key out of the ignition. The only way to get it to stop was to disconnect the battery.

Figured the contacts in the starter arc’d due to a low battery or something of the like. I replaced the starter and the battery, went to fire it up, and the same thing happened. Brand new starter kept turning over even after the engine fired.

I have an idea what the problem is, but I wanted to throw it out there to see if anyone else has had any experience with this sort of thing.