1970 LS-5 tcs switch lead

[Eugene V.]

Hello,

Does anyone have a photo of the TCS thermal switch lead from the switch in the cylinder head to the wiring harness? I want to see the routing and try to determine the appropriate length of the lead. The replacement lead that I have appears to be much too long.

Thanks,

Gene Ventura

[Warren F.]

Re: 1970 LS-5 tcs switch lead

Gene,
I'm sure someone will chime in with a photo soon. The wire harness when connected to the TCS switch runs forward along the rocker arm cover to the front engine lift bracket, around it and runs rearward along the rocker arm cover back to the firewall being held in place by the metal tangs of the rocker arm cover.

[Eugene V.]

Re: 1970 LS-5 tcs switch lead

Warren,

Thanks for your reply.

I was unclear with my first request so I will try it again. I am interested in the lead for the thermal switch in the passenger side cylinder head to the wiring harness.

Thanks again,

Gene Ventura

[Monte M.]

Re: 1970 LS-5 tcs switch lead

Eugene,
When I was doing research on the TCS for my 72 with a 454 in it, I saved pictures of 70-72 TCS set-ups. I have some pictures of 1971 big block, but I am not sure exactly where your TCS is.

If this is where your TCS is, the other picture is the jumper, if I am not mistaken.
Again, I know the 1972 TCS really well, but nobody else chimed in, sio I thought I would at least try to help.

EDIT: after looking at it longer, it does not appear to be the correct jumper. Sorry.
Monte

[Eugene V.]

Re: 1970 LS-5 tcs switch lead

Monte,

Thanks for your reply

Actually,that is the jumper in question. It runs from the harness to the switch in the head. It appears to be much longer than required. I was hoping for a photo of a big block setup. The placement of the TCS relay differers between a '70 and a '71 and '72 and I am not certain if that affects the jumper length for each respective year or not.

I did find a photo of that jumper on a small block and I will use that as a routing and length guide if all else fails.

Thanks again,

Gene Ventura

[Terry M.]

Re: 1970 LS-5 tcs switch lead

Monte,

Thanks for your reply

Actually,that is the jumper in question. It runs from the harness to the switch in the head. It appears to be much longer than required. I was hoping for a photo of a big block setup. The placement of the TCS relay differers between a '70 and a '71 and '72 and I am not certain if that affects the jumper length for each respective year or not.

I did find a photo of that jumper on a small block and I will use that as a routing and length guide if all else fails.

Thanks again,

Gene Ventura

Gene,

The "jumper" in Monte's reply is for the temperature sensor in the passenger side head. I have seen some wiring harnesses with the separate harness shown by Monte and some that have that harness as an integral part of the wiring harness. You are right in that "jumper" harness is too long for your application. A little creative shrinking will make it useable.

For 1970 BB the solenoid for the TCS ported vacuum to the distributor is on the intake manifold about centered between the two heads in front of the carburetor. I believe M Dobbins has a picture of that in the Vette Vues Fact Book 1968-1972 Corvette. I am working that from memory because that book is not accessible to me any longer.

[Patrick H.]

Re: 1970 LS-5 tcs switch lead

FWIW, on the 72 small blocks I've worked on and viewed, I leave the tape ON the wiring as shown in Monte's photo and it works just fine. I suspect that Gene can do the same.

Why is the tape there and the wire extra long? I have no idea.

[Eugene V.]

Re: 1970 LS-5 tcs switch lead

Terry,

Thanks for the reply.

The wiring harness that I purchased had the jumper as an integral part of the harness, however, the harness that is currently on the car used a jumper with a connector. I am in the process of doing "A little creative shrinking", but I am trying to determine the level of creativity and the amount of "shrinkage" required.

Thanks again,

Gene

[Terry M.]

Re: 1970 LS-5 tcs switch lead

FWIW, on the 72 small blocks I've worked on and viewed, I leave the tape ON the wiring as shown in Monte's photo and it works just fine. I suspect that Gene can do the same.

Why is the tape there and the wire extra long? I have no idea.

I would venture a guess. It is that long so the vendor can sell the same part to folks with cars with much larger engine compartments -- say Chevelle or other A-body cars, or full size Chevrolet (B-body) or who knows maybe even Cadillac.

[Patrick H.]

Re: 1970 LS-5 tcs switch lead

I would venture a guess. It is that long so the vendor can sell the same part to folks with cars with much larger engine compartments -- say Chevelle or other A-body cars, or full size Chevrolet (B-body) or who knows maybe even Cadillac.

Could be.

I should see if I have the original from one of the cars and verify length.

[Monte M.]

Re: 1970 LS-5 tcs switch lead

Here is a picture of a 1970 big block. How you described the location of the TCS switch, I assumed it was a small block you were asking about.
Thiswill only give you an idea, but at least it is something.

EDIT; Your title does say LS-5. In reading your question, I somehow got small block in my brain. Sorry about the mistake on my part.

[Eugene V.]

Re: 1970 LS-5 tcs switch lead

IMG_3570.jpg


Monte,

Thanks again for your reply.

Since a picture is worth a thousand words here is a photo of the TCS switch I am referring to. It is just to the left of the dipstick. I am hoping to find a photo with the jumper in place showing the correct length and routing.

Thanks to everyone for thier help,

Gene

[Chris H.]

Re: 1970 LS-5 tcs switch lead

Photo from my 70 LS5, VIN 531.

IMG_9595.jpg

[Terry M.]

Re: 1970 LS-5 tcs switch lead

[ATTACH=CONFIG]46204[/ATTACH]


Monte,

Thanks again for your reply.

Since a picture is worth a thousand words here is a photo of the TCS switch I am referring to. It is just to the left of the dipstick. I am hoping to find a photo with the jumper in place showing the correct length and routing.

Thanks to everyone for thier help,

Gene

Gene,
That is a temperature sensor -- although it could be described as a switch because it functions as a switch. I wanted to distinguish between the sensor and the solenoid so we are sure what you are asking about.

[Monte M.]

Re: 1970 LS-5 tcs switch lead

Gene,
I was aware that you were looking for the wiring that attached to the head. The fact that no one else was coming up with what you needed, I would show you that that wires went to the back of the head. At that point you could guesstimate how the wires split and ran down to the sensor.
I am trying to locate a picture for you, but at this point is seems like you are making the jumper anyway. I would guess the having the "Y" in the jumper behind the passenger side head would do the trick for now.
I know that is not the result you are hoping for, but "guesstimating" in this hobby is more common than one might think.

Best of luck,
Monte

PS If I do get the picture from my friend, I will pass it on.