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7/29/13 9:19pm - Original Message: 'Intermittent cranking'
VicA Gold Member
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Palmyra, VA - USA

Vette(s):
1982 - Bright Blue Metallic

Joined: 12/30/2007
Posts: 3
I have been working an intermittent problem for awhile on my 82. At times, car will not start. Starter solenoid does not kick in.  Dash lights OK. Starter and battery checks good (done out of car). When car cranks, starts and runs ok. Checked voltage at theft deterrent relay. Good voltage when cranks, but noticed about 9 volts when doesn't crank. Neutral safety and deterrent are ok.  Jumped from battery to solenoid side of theft deterrent relay.  Starter cranked.  So, started chasing things where there could be a voltage drop, focusing on grounds.  Seems like every time I touch something, car cranks. Jumped from frame to starter. Cranked a few times, then same problem. Cleaned and redid frame to engine ground, and battery to frame ground - ok for while. Although a long shot, changed the fusible link on B+ terminal of starter.  Then because I had two fusible links, changed link that goes to alternator.  I am going to continue redoing ground points.  Any other suggestions?  Bottom line seems to be there's voltage, but at times there's a drop somewhere that prevents starter from cranking. Car is looking real good though as when I'm frustrated, I clean it. So, the underside is looking just as good as the body.
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7/29/13 10:22pm - Reply: 'Re: Intermittent cranking'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19448
VicA said:  Checked voltage at theft deterrent relay. Good voltage when cranks, but noticed about 9 volts when doesn't crank. 

Looks to me like you have either a problem with the ignition switch, or the theft deterrent module...
If you are seeing the 9v at the purple/white wire, at the relay when it doesn't crank, the problem is the ignition switch.






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Joel Adams
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7/30/13 4:52pm - Reply: 'Re: Intermittent cranking'
eldredjames Lifetime Member
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Temple City, CA - USA

Vette(s):
1969 Daytona Yellow. 350 / Automatic.

Joined: 10/3/2010
Posts: 361
You said you checked the battery out of the car.  Might want to check the vltage in the car when it won't start.  Just in case there is an intermittent short between two cells.  Just in case, to rule it out...

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8/4/13 11:40am - Reply: 'Re: Intermittent cranking'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats

Joined: 1/28/2010
Posts: 763
Every time I've had that problem with a Chebby, it is the solenoid itself on the starter that is bad. Works sometimes and don't even get a click others. Replacing solenoid or starter solved the problem all the time.

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9/2/13 9:39pm - Reply: 'Re: Intermittent cranking'
VicA Gold Member
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Palmyra, VA - USA

Vette(s):
1982 - Bright Blue Metallic

Joined: 12/30/2007
Posts: 3

The light came on when I looked at the ignition switch and didn't see the yellow solenoid wire.  The car had an aftermarket alarm system installed by the first owner.  I'm the second.  I started tracing the wire installed in place of the solenoid wire and found two relays.  To make a long story short, I spent a whole day ripping out the alarm system and rewiring.  Alarm system was very intrusive.  Car has cranked every single time since the alarm removal and subsequent rewiring.  Thankfully I have a shop manual with complete wiring diagrams.

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9/2/13 10:14pm - Reply: 'Re: Intermittent cranking'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19448
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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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