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!970 won't turn over.

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Old Aug 10, 2025 | 10:27 AM
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Default !970 won't turn over.

When I try and start my 1970 SB 4 speed corvette everthing lights up on dash put the starter won't engage when I turn the key to start. Any ideas? Thanks.
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Old Aug 10, 2025 | 10:48 AM
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I would clean and tighten your battery connections, including the negative battery cable ground on the frame.
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Old Aug 10, 2025 | 05:03 PM
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Bad clutch neutral safety switch?
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Old Aug 10, 2025 | 09:57 PM
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After you do the things others have suggested, see if you can climb or wriggle under the car and tap the starter a few times with a rubber mallet, not hard enough to do any damage, but hard enough to shake things up down there. Also check the starter solenoid (attached to the top of the starter) for a good connection.
Regards
Roy
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Old Aug 11, 2025 | 03:35 PM
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Interesting post! I went out Sunday after noon to fire up the 68. Nothing. Turning the key to the start position, just caused the seat belt light on the console to dim. Damn. The engine is a ZZ4 and it has a mini-starter. I'll take my voltmeter and head out soon to start with some of the obvious checklist items.
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Old Aug 12, 2025 | 10:21 AM
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Make sure you push your clutch pedal all the way down. Easy first step.
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Old Aug 12, 2025 | 12:52 PM
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Hello,

​​​​I too think checking the neutral safety-switch on the clutch/brake bracket is a good idea.

Regards....

Pretty nice detailed work!!!





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Old Aug 13, 2025 | 03:46 AM
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Originally Posted by 68/70Vette
Interesting post! I went out Sunday after noon to fire up the 68. Nothing. Turning the key to the start position, just caused the seat belt light on the console to dim. Damn. The engine is a ZZ4 and it has a mini-starter. I'll take my voltmeter and head out soon to start with some of the obvious checklist items.
Caution:
Most (Not All) so called mini-starters have Permanent Magnets (in lieu of wound field coils). Be 'judicious' when rapping on its starter case with a hard tool or hammer. Those Permanent Magnets are a ceramic extrusion which is quite brittle and are held tightly to internal wall of case. They will easily crack from shock of a hammer (T shirt). Once cracked, they're junk; because that irreversibly disrupts & rearranges their magnetic field.
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Old Aug 13, 2025 | 05:49 PM
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Originally Posted by Rebelyell
Caution:
Most (Not All) so called mini-starters have Permanent Magnets (in lieu of wound field coils). Be 'judicious' when rapping on its starter case with a hard tool or hammer. Those Permanent Magnets are a ceramic extrusion which is quite brittle and are held tightly to internal wall of case. They will easily crack from shock of a hammer (T shirt). Once cracked, they're junk; because that irreversibly disrupts & rearranges their magnetic field.
Thanks for the interesting comment about mini starters. Actually, I did go out and bless the starter solenoid with a hammer tap to no avail. Having someone else try to start the car, I did read 4.87 vDC. This was apparently not enough voltage to actuate the solenoid. I later when out, with no key in the ignition, applied 12 vDC directly to the solenoid, and the mini-starter sprang to life. Then went in, turned the key to start, the starter cranked and the engine immediately started.
......Short term happiness. While running the engine to warm it up, I notice the ammeter reading a full 30 amp (pegged). Turned off the engine. Will go out to trouble shoot this today. Classical symptom, for a car with an electrical fuel pump and electric fan, of an alternator failure. It's a new alternator, of course, so I'll go out and look for other gremlins. This car has been in storage for a long time.....hope there's not an internal short somewhere.
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Old Aug 14, 2025 | 04:00 PM
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Rapping-tapping solenoid will not harm mini-starters' permanent magnets; But hitting starter motor case can & does.
Prior poster suggested cleaning ground cable and chassis ground point(s); I suggest same.
It's not uncommon for a cable to become severely but internally corroded, But well-hidden beneath its heavy plastic outer insulation; often requires slitting insulation & peeling it back to reveal the cancer. Replacement cables are remarkably inexpensive; do opt for heavy gage.

*nothing can reveal (& measure) a faulty battery (even a new but bad one) better than a true carbon-pile load tester; Local starter/alt/gen Rebuilder shops have em.
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Old Aug 14, 2025 | 04:16 PM
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Like one of these.


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Old Aug 14, 2025 | 04:30 PM
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YES, like a SUN VAT-40
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