no crank
Thread Starter
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Joined: Oct 2013
Posts: 66
Likes: 1
no crank
hello I have a 1978 corvette automatic. my engine will not crank. battery and starter are good. I found that I have no power in the yellow wire going to the neutral safety switch. My question is does the power in this wire come directly from the igntion switch? What is the best way to replace the ignition switch? Thank you
Melting Slicks
Joined: Feb 2018
Posts: 2,326
Likes: 721
From: Marietta GA
Are all the other electrical devices working when you turn the key switch to “Run”? If everything else operates, then take a small wire with two alligator clips and attach it to the safety start switch contacts. If you still don’t get the starter to crank, check the switch (controlled by the key switch) located at the bottom of the steering column. You will need a wiring schematic for your year card to identify the appropriate wires to check. Good Luck.
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Drifting
Joined: May 2020
Posts: 1,663
Likes: 702
From: Baton Rouge, Louisiana, metro area
Either way, are you supposed to have positive 12v through that wire, or does the Park switch complete a ground for the negative side of the starter circuit (the purple wire on your solenoid)?
I don’t have a wiring diagram for your model, so I am just asking.
Racer
Joined: Oct 2018
Posts: 457
Likes: 132
From: England
The yellow wire does come directly from the ignition switch, if everything else in the car that requires the ignition to be switched on works then you must have power to the ignition switch. That leaves 3 possibilities
1) the ignition switch is faulty
2) the ignition switch is not adjusted properly
3) there is a break in the yellow wire between the ignition switch and the neutral safety switch (there is a connector for the neutral safety switch wires near the switch, that could not be connecting properly)
1) the ignition switch is faulty
2) the ignition switch is not adjusted properly
3) there is a break in the yellow wire between the ignition switch and the neutral safety switch (there is a connector for the neutral safety switch wires near the switch, that could not be connecting properly)
Melting Slicks
Joined: Apr 2021
Posts: 2,709
Likes: 2,155
From: Minnesota
You mention you have an automatic transmission. Is that a “Park” switch? I thought a Neutral switch was for manual transmissions.
Either way, are you supposed to have positive 12v through that wire, or does the Park switch complete a ground for the negative side of the starter circuit (the purple wire on your solenoid)?
I don’t have a wiring diagram for your model, so I am just asking.
Either way, are you supposed to have positive 12v through that wire, or does the Park switch complete a ground for the negative side of the starter circuit (the purple wire on your solenoid)?
I don’t have a wiring diagram for your model, so I am just asking.
Although there isn’t a yellow wire. OP, could you post a picture of where you’re checking?
