Topic: Help with wiring
in Forum: C3 Electrical
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Well Ladies and Gentlemen, I finally got the tranny swapped, differential rebuilt and installed, everything is ready to go, but the doggone speedo cable is too short, so I ordered one.
Am awaiting it's arrival, so I can install the dash, hook the gauges and install the steering wheel. Out of curiousity, I tried to start the car, in neutral, clutch in, parking brake on, foot on the brake, etc. as I would hate to have her rolling and I cannot steer her.
I did install the backup light switch, clutch neutral start swith to the wiring on the old neutral safety switch for auto transmission, but am not positive the clutch neutral start switch is working properly as it is not new or if that is where I should make them up as I cannot find it in the shop manual.
MY question is, is it possible the car won't start due to the gauges not being hooked up? A friend of mine - long distance buddy - told me I could do without the clutch neutral start switch, just make sure I connect the (2) purple wires that eventually make their way to the starter solenoid.
I still have the console out and I gotta tell you, there are approximately (4) purple wires in there. One purple/white wire goes to the old Automatic Neutral Safety Switch. The starter interrupt relay has (2) purple/white wires and (1) thick purple wire which appears to be going to the starter solenoid - acording to the shop manual.
I think I would have to splice the purple/white from the neutral safety switch to the large purple going to the starter interrupt relay.
I am being patient and waiting to get it all put together minus the console, as I don't want to bubba the wiring, but I really don't want to have to dig under the dash and replace the clutch neutral start switch if I don't have too, meaning, I will make the splice.
Another question is has anyone made this conversion, bypassed the clutch neutral start switch and what wires did you splice?
Thanking you in advance for your recommendations.
Gurtz
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Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
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#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
The large, purple wire on the NSS does indeed go to the "S" terminal of the starter solenoid. It "tees" off to go to the starter interrupt solenoid. The purple/white wire would(on a standard) go to the clutch switch, and it also goes to the starter interrupt. Jumper the large purple wire(at the NSS connector) to the yellow wire at the NSS connector, and it should start.
I will say this, and this is just my opinion, so take it as it is....
I would not bypass the NSS/clutch switch function permanently. If all you want to do is start it a few times, ok, but...trust me...if you completely bypass the nss, you will eventually run into something with the car while starting it.
Not a good feeling...
Test the clutch switch to see if it is ok. You can check it with an ohm-meter easily. The switch must make contact when pulled.
If the switch is good, then you may just have a wire that isn't connected right yet. One wire from the clutch switch should go to the purple wire at the old NSS connector, and the other wire from the clutch switch should go to the yellow wire at the old NSS connector.
hth
I will say this, and this is just my opinion, so take it as it is....
I would not bypass the NSS/clutch switch function permanently. If all you want to do is start it a few times, ok, but...trust me...if you completely bypass the nss, you will eventually run into something with the car while starting it.
Not a good feeling...
Test the clutch switch to see if it is ok. You can check it with an ohm-meter easily. The switch must make contact when pulled.
If the switch is good, then you may just have a wire that isn't connected right yet. One wire from the clutch switch should go to the purple wire at the old NSS connector, and the other wire from the clutch switch should go to the yellow wire at the old NSS connector.
hth
Joel Adams
C3VR Lifetime Member #56 
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Dr. J:
I knew you would reply and I thank you for doing so. It makes sense to jump the yellow and purple, but my bud said 2 purples - that is what was throwing me. I am with you!
Is there any particular volt measurement that should read while testing or any measureable amount sufficient testing the CSS.
thanks,
RG
Lifetime MemberModerator
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
You can check for 12v at/thru the switch if it is connected right, but...there has to be 12v at one of the terminals, key on. In your particular situation, your 12v would need to come from the yaller wire from the original NSS connector. Then, the other wire from your clutch switch would go to the purple wire at the original NSS connector.
You could also simply measure the ohms at to two terminals with the switch dis-connected. There should be "0" ohms one way, and infinity the other....basically just an "on/off" switch. Does that make any sense?
If you have a wiring diagram for the car, you'll notice that it also shows the schematic for the clutch switch, just above the automatic's NSS...
You could also simply measure the ohms at to two terminals with the switch dis-connected. There should be "0" ohms one way, and infinity the other....basically just an "on/off" switch. Does that make any sense?
If you have a wiring diagram for the car, you'll notice that it also shows the schematic for the clutch switch, just above the automatic's NSS...
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"
not sure about your car starting with the dash disconnected my 78 will start with the dash disconnected but will not idle or run for crap till the dash is hooked back up (don't ask me why) and if you bypass the clutch safety to start the car your wife will hit a still post in front of a seven-eleven and crush the left front fender (this is a fact i can verify)
Annicorvette
Lifetime member # 35 
just got her cranked by temporarily tieng the yellar and pnurple wires together, she cranked right up, but it almost sounds as if the starter is hanging up. IT is not a gragging noise, but like a slapping noise.
I have a friend coming by in a little for something else and I want him to crank it so I can get a better idea of where the slapping is coming from.
I do have the same tooth count flywheel as I had before with the auto. I did install a high torque mini starter due to the heat issues. Someone told me I could not use that starter. Obviously I did not listen. Is there any truth to that statement? They never said why and the conversation had ended before I could get his opinion.
Yes, Joel your ohm testing makes sense. Is it possible I have the two prong connector at the clutch start switch backwards or can it be backwards?
Lifetime MemberModerator
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
The clutch switch(or ANY two wire switch) will work either way. It's simply an "On/Off" switch...polarity doesn't matter.
As for the noise, did you install the sheet-metal dust shield/cover on the bellhousing? If so, I'd look at that before condemning the starter, or the flywheel. It can be touching/rubbing the flywheel as it turns, and make a noise.
Don't have a clue about why you wouldn't be able to use a mini-starter. If it's the right one for the application, it should work.
As for the noise, did you install the sheet-metal dust shield/cover on the bellhousing? If so, I'd look at that before condemning the starter, or the flywheel. It can be touching/rubbing the flywheel as it turns, and make a noise.
Don't have a clue about why you wouldn't be able to use a mini-starter. If it's the right one for the application, it should work.
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"
I agree with you on the starter, planned on dropping the dust cover and checking her out first.
thanks
in Forum: C3 Electrical
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