Topic: Won't Start
in Forum: C3 Electrical
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SHELBYVILLE, TN - USA
Joined: 7/5/2002
Posts: 3942
Vette(s): 1976 L48 auto
1978 L82 4speed
1994 LT1 6speed
1978 L82 4speed
1994 LT1 6speed
i think the neutral switch is right where you think, above the clutch pedal.... that could pose an issue for getting the starter in motion, if its "non-co-opertive"... so the battery did check out?...
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Check for power to the "s" terminal at the starter when trying to start it. This is the small terminal closer to the engine block. If it has power when turning the key to start, you have a starter or connection problem at the starter or cable. If you do not have power there, use a jumper to contact that terminal to the battery terminal right next to and above it. The car should crank. If not, back to cables and connections, or starter.
If you do not have power to the s terminal when trying to crank, then check the neutral starter (clutch) switch. The Nss gets it power from the ignition switch. From the switch to the Nss it is a yellow wire, from the Nss to the starter it is purple.
Not to veer off in a different direction but...
Could the recently installed headers be cooking the ingition module in the new HEI?
What brand HEI did you use?
I put in a Mallory last spring and the ignition module doesn't like the heat.

Warner Robins, GA - USA
Joined: 2/16/2003
Posts: 244
Vette(s): 1978 Base model, White w/red int. L-48, 4-speed, wide ratio. Has 82 CE wheels. New HEI & LT1 Headers now. UPDATE, NEW Tremic 5-SPEED installed.
2007 C6 Yellow Conv. Loaded. UPDATE-Sold Sept. 2021
2016 C7 Yellow Coupe, Z-51, lots of other options.
Yes Jim the battery is fine, SG in each cell was 1.275 to 1.3. Do you think that the small rod above the steering column that seems to be loose is attached to the NSS, it is up by the clutch peddle side of the steering column? I was thinking that there was only a couple of wires for the NSS, like Ken says( From the switch to the Nss it is a yellow wire, from the Nss to the starter it is purple). I'll have to remove a plastic A/C duct to see up there.
Ken: How many volts should be at the "S" post? I used a voltmeter and checked from the big starter post to the "S" post. With the key in "on" there was 12 volts there and with the key in "start" there was 10 volts. Should I measure from some other location to the "S" post? Would just a 12 or 14 gauge wire be OK for a jumper and does the clutch peddle need to be depressed when I jump the 2 posts? Should the key be in "Start" or just to "ON"?

Warner Robins, GA - USA
Joined: 2/16/2003
Posts: 244
Vette(s): 1978 Base model, White w/red int. L-48, 4-speed, wide ratio. Has 82 CE wheels. New HEI & LT1 Headers now. UPDATE, NEW Tremic 5-SPEED installed.
2007 C6 Yellow Conv. Loaded. UPDATE-Sold Sept. 2021
2016 C7 Yellow Coupe, Z-51, lots of other options.
Kevin: I put a PROCOMP ELECTRONICS HEI PC-9000 in this past June and have only put a couple hundred miles on the car since then. About 140 miles before the new headers and that's when it cut off or lost power for a split second 2 or 3 times. Every time was within 10 minutes after starting the engine and leaving my house. I drove her 50 miles home after having the new exhaust pipes and mufflers installed and she never lost power at all. Saturday I drove 5.5 miles over to my sons house, one hour later I tried to start it up to leave and she wouldn't start. I thought that the headers would lower the temp. under the hood compared to cast iron "Ramhorns". Am I wrong there, I know they sure cool down faster? Thanks for the question, I was thinking that something might be wrong with the dist. module because the Tach drops to "0" instantly when she looses power. Have you changed out your module?

Moderator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
First, if you do jump the starter, be SURE the trans is in NEUTRAL!! Don't want no surprises!
The "S" terminal should have battery voltage when the key is in the "Start" position. You want to measure the voltage from a good ground, such as the engine block, or the starter bolts, to the "S" terminal.
One quick test of the clutch safety switch is to watch the brightness of the dash lights. With the key on, turn the key to "Start" with the clutch UP. Then with the key still turned to Start, mash the clutch DOWN...if you see a change in the brightness of the dash lights when the clutch nears the floor, then the clutch switch is working.
Doesn't hurt to check it with a voltmeter, too, but this is just a quick way to check it.
You say the car died...do you mean it died while it was running, and it hasn't started since, or, did you turn it off, and now it won't re-start? Does it simply not crank, or does it crank, but not start up?
From your first post, it really sounds like you have a bad battery cable/connection.

The "S" terminal should have battery voltage when the key is in the "Start" position. You want to measure the voltage from a good ground, such as the engine block, or the starter bolts, to the "S" terminal.
One quick test of the clutch safety switch is to watch the brightness of the dash lights. With the key on, turn the key to "Start" with the clutch UP. Then with the key still turned to Start, mash the clutch DOWN...if you see a change in the brightness of the dash lights when the clutch nears the floor, then the clutch switch is working.

You say the car died...do you mean it died while it was running, and it hasn't started since, or, did you turn it off, and now it won't re-start? Does it simply not crank, or does it crank, but not start up?
From your first post, it really sounds like you have a bad battery cable/connection.
Joel Adams
C3VR Lifetime Member #56
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Warner Robins, GA - USA
Joined: 2/16/2003
Posts: 244
Vette(s): 1978 Base model, White w/red int. L-48, 4-speed, wide ratio. Has 82 CE wheels. New HEI & LT1 Headers now. UPDATE, NEW Tremic 5-SPEED installed.
2007 C6 Yellow Conv. Loaded. UPDATE-Sold Sept. 2021
2016 C7 Yellow Coupe, Z-51, lots of other options.
Thanks Joel, I will check it out today. To answer your question, she wouldn't start after setting for about an hour at my son's house. She started fine here at home, I drove 5.5 miles to his house stayed about an hour, came out to leave and there was nothing, not even a "click" out of the solenoid when I turned the key to start.
Hey Chuck,
I read through all this again and I'm thinking a bad ingition module wouldn't leave you with nothing when you turn the key.
The talk of voltage and good grounding makes more sense as far as getting some energy in to the starter and so on.
I'm going to swap out my Mallory for an MSD this fall when $$$ allows.
In the meantime I keep a spare ingition module in the glovebox to replace as needed.
Kevin

Greensburg, IN - USA
Joined: 9/24/2003
Posts: 5188
Vette(s): Previous: 1984 Silver / Charcoal Coupe, 1988 Maroon Coupe / 1989 Artic White Coupe / 2001 Speedway White Roadster / Present:1976 Stingray Black / Black, Auto, 350 slightly modified (355 hp) Luxor Wires Redline Tires. / 1989 Roadster Bright Red...
I put my money on a ground wire. Does it have power to anything or is it completely dead? (no lights, no radio, zero?)
If so ... check your ground wire from the battery to the crossmember. (they corrode, split open, break off, because they are very seldom looked at.
Another thought might be the fusible link. It could be getting hot and breaking down.
If so ... check your ground wire from the battery to the crossmember. (they corrode, split open, break off, because they are very seldom looked at.
Another thought might be the fusible link. It could be getting hot and breaking down.
I agree about the ground. Are you sure you got the frame to motor ground installed? With headers, it's kinda in the way, at least on my black79. Had to move it to the front of the motor. Here's where it should be but may have been moved.

mkapp7879 2008-09-09 15:03:27
Also, since you've had the starter off, did you reconnect the black wire in the harness to ground? Some have mistakenly attached it to the big terminal on the solenoid cause it has a big connector on it.

in Forum: C3 Electrical
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