Help needed in identifying broken wire in 70 Corvette engine compartment

[Patrick B.]

Re: Help needed in identifying broken wire in 70 Corvette engine compartment

Monte and Russ-- When I removed the TCS stuff in 1972 I think I hooked all the extra wires to the existing wire clips to get them out of the way without removing the connector bodies. I discovered a 2 wire bundle with a double connector which I think would go on the TSC solenoid. One wire was blue and I can't remember the other's color, but I may be able to go to my garage tomorrow to check it. I found another short green wire on the engine harness behind the passenger side of the engine that I think went to an engine temp sensor that was part of the TSC. However it would need another connected to it to reach the cyl head.

Russ-- I do not know what the little box with 3 wires going to it is. I am repeating the picture here that you referred to and adding a closer-up picture with the three wires in the upper corner of the shot. You mentioned yours has a double connector and a receptacle for a single connector behind it. Mine has three separate connectors the out connectors have a blue wire at the top and a green wire below. The inner top connector has a wire that looks grey in the more distant shot, but looks more like dull black in the close-up shot of it together with the blue and green wires. If you look at the lower outer connector with the green wire in the distant picture you can use it for a location reference in the close-up picture and see the blue, green and dull black wires running side by side. It is not obvious where the wires go since they are descending toward the bottom of the firewall. I'll try to jack the car up to get a better look.

[Monte M.]

Re: Help needed in identifying broken wire in 70 Corvette engine compartment

Removed this one. It is getting too complicated on a simple subject. Take a look at my next post to see if it is a simple as it looks.

Best of luck.

[Patrick B.]

Re: Help needed in identifying broken wire in 70 Corvette engine compartment

While the 70 shop manual has the 69 Corvette material instead of 1970, the 70 assembly manual should have the correct wiring diagrams. I will try to remember to bring home the assembly manual to research some of these issues.

[Monte M.]

Re: Help needed in identifying broken wire in 70 Corvette engine compartment

It could be a simple as the green goes to the temp switch on the head, the dark blue goes to the TCS solenoid, and the black goes to the trans switch.
If that were the case, all you would need is power to the other side of the TCS solenoid.

There are a couple of ways to make it work with just the three wires that are on the relay that is on the wall.

Could be that easy. That would work just fine.

Best of luck.

Monte

[Russ S.]

Re: Help needed in identifying broken wire in 70 Corvette engine compartment

The two wires that I have on this new wiring harness are also green and blue but the harness appears to be missing the third wire. If it's all TSC stuff it may not matter as this is a non judged driver.

Monte and Russ-- When I removed the TCS stuff in 1972 I think I hooked all the extra wires to the existing wire clips to get them out of the way without removing the connector bodies. I discovered a 2 wire bundle with a double connector which I think would go on the TSC solenoid. One wire was blue and I can't remember the other's color, but I may be able to go to my garage tomorrow to check it. I found another short green wire on the engine harness behind the passenger side of the engine that I think went to an engine temp sensor that was part of the TSC. However it would need another connected to it to reach the cyl head.

Russ-- I do not know what the little box with 3 wires going to it is. I am repeating the picture here that you referred to and adding a closer-up picture with the three wires in the upper corner of the shot. You mentioned yours has a double connector and a receptacle for a single connector behind it. Mine has three separate connectors the out connectors have a blue wire at the top and a green wire below. The inner top connector has a wire that looks grey in the more distant shot, but looks more like dull black in the close-up shot of it together with the blue and green wires. If you look at the lower outer connector with the green wire in the distant picture you can use it for a location reference in the close-up picture and see the blue, green and dull black wires running side by side. It is not obvious where the wires go since they are descending toward the bottom of the firewall. I'll try to jack the car up to get a better look.

[Patrick B.]

Re: Help needed in identifying broken wire in 70 Corvette engine compartment

Russ---The third wire is actually black with a pink stipe. The green, blue and black/pink wires all are part of a bundle that goes to the inboard bulkhead connector. The 1970 Assembly Manual has a wiring diagram that shows the correct number of wires and components. However it shows the black/pink wire as pink. Mine is a late car so perhaps the color of that wire changed after the assembly manual was printed. Like you, I don't really want to reconnect the TCS system but I was concerned about having a dangling cut wire.

[Monte M.]

Re: Help needed in identifying broken wire in 70 Corvette engine compartment

Patrick,
Have you figured out what the three wires are for? I agree with you that there is no good that the TCS does for the car. Even though my 72 LS-5 has 40K original miles on it, I learned about the TCS because I too had a few extra wires hanging around that i did not know where they went.

That said, because my car is so original, I wanted my car to at least look original. My TCS is in place, but does not work.
With the exception of the fast idle solenoid. The 72 has a fast idle solenoid that dicks up the idle when you turn on the air conditioning. The A/C compressor coming on typically makes the idle drop a few hundred RPM.

The real funny thing is I started learning about the fast idle solenoid on my 69 when I was a kid. My 69 was a 350 horse, 350, with A/C. To keep that 11:1 motor going the idle was a bit high. The problem was when you turned off the key, they typically dieseled, or kept running a bit. Basically, they did not shut off. This was very hard on those high performance engines.

Anyway, I hooked up the fast idle solenoid to the A/C system. The idle screw on the carb was not in use at all. It was just the fast idle solenoid that kept the car at idle. When you turned the key off it shut off the solenoid dropping the idle on the carb to zero letting the engine shut off.

At the time I was in my mid twenties. I had no idea it was the beginnings of what would become the TCS system of the future. Those were the good old days when you wanted to own a Corvette to drive it and not worry about how correct it was or if you wee going to make money on it when you sold it.

I am glad you guys are getting these things resolved. If there is ever anything I can do to help, just let me know.

Monte

Patrick,
I will look at the pile of wiring diagrams that I have to see if I can locat those three wires as a cluster and let you know if I findabything.