'71 &LT1 TCS Switch Jumper Wire - Routing Help

[Ray K.]

On a '71 &LT1, can anyone help me with the routing of the green jumper wire that goes from the engine wiring harness to the TCS Switch (located in the RH cylinder head?

I've looked in my '71 AIMS and can't find any references to the TCS switch (GM # 8469875) or the green jumper wire (p/n unknown).

Appreciate any help in the routing and/or where these can be found in the'71 AIMS.
Here are pictures of both.
Ray K (#43777)71 Vette - Temperature Sensor Switch - 28May22.jpg71 Vette - Temperature Sensor Switch - Jumper Wire - 28May22.jpg

[Terry M.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

Ray
The end with the two connectors goes to the temperature sensor. It makes no difference which connector goes to which tab. I usually see a single right angel connector to plug into the temperature sensor, but go with what you have.

The single end goes to a connector in the wire harness. The harness that goes across the fire-wall (I know that is the wrong term, but if I use the correct one no one but you and I will know what I am talking about) at the back of the engine. Some harnesses will only have a green wire, and no connector. If that is the case you will have to cut the connector from the wire you show and splice the green to green wire. Hide the splice in the larger harness. There are no retainers for the green wire to the temperature sender. The green wire comes out of the harness near the actuator for the wiper door.

YNMELxLw.jpg

This is the best I have on hand. Sorry it doesn't show the connection to the cross firewall harness.I hope all this makes sense.

[Ray K.]

[James G.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

It really just kind of hangs there. I have kind of pushed mine up behind the heater hoses to keep it from contacting the exhaust.


20190811_164012.jpgNo matter what I do the photo uploads upside down...
I rotated the photo rightside up and it inserts upside down... I put it on the side and it re-orients it upside down.

[Ray K.]

[Owen L.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

On page M245, the '72 AIM shows the wire (#6, switch #7) running through a clip on the firewall but that's it:

Screen Shot 2022-05-29 at 9.05.34 AM.jpg

[Terry M.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

Ray,
All my AIMs are not at hand, but I'll take a look later this holiday weekend. If in there, it is not in the LT1 section because all engines (BB & SB) had the same emissions temp sensor wiring for 1970-72 (TCS & CEC). Jim G's picture is better than mine. The heater hoses do provide a convenient routing for the wire, as he shows.

BTW: Up close to the temp sensor connector (where there are three wires) there is supposed to be a piece of tape wrapped around all three wires. A narrow band of the textured friction-like tape to hold all three wires together. With the ignition shields in place that tape will be hard to see.

I often see the connector at the sensor melted from exhaust heat. That connector is the same as the one used for turn signal flasher, or UA6 flasher if one has that option. Most often I see the wire(s) disconnected on driver cars and the owner is none the wiser.

We may be in an area where even if there is a defined route in the AIM the line workers put it where it worked for them, but I'll look. There are no retainers in the area that would help, although I sometimes see the excess green wire wrapped through a retainer on the firewall.

[Terry M.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

On page M245, the '72 AIM shows the wire (#6, switch #7) running through a clip on the firewall but that's it:

[ATTACH=CONFIG]111881[/ATTACH]

Thanks Owen, you saved me a trip to the storage site. You beat me to the AIM.

[Ray K.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

All,
Thanks for your efforts in my "quest" for the temperature sensor switch "green jumper" wire routing.
I went back and compared my '71 and '72 AIMs and found that the green jumper wire is "nowhere" to be found in the '71 AIMs (ref View A). The '72 AIMs clearly shows the routing, utilizing a clip on the firewall to retain it (ref View C).

For those in need of a visual comparison, I've attached jpegs of both the '71 and '72 AIMs pages.
Once again, thanks to all for your responses.
Ray K

[James G.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

Much like the LT1 fuel line. Not illustrated in the 1971 AIM. I believe it is in the 1972 AIM.
FWIW the 1971 top of engine schematic is not representative of LT1. It shows a TCS solenoid on the right not a carb solenoid on the left, is that how the base engine is equipped?

[Terry M.]

Re: '71 &LT1 TCS Switch Jumper Wire - Routing Help

Much like the LT1 fuel line. Not illustrated in the 1971 AIM. I believe it is in the 1972 AIM.
FWIW the 1971 top of engine schematic is not representative of LT1. [B] It shows a TCS solenoid on the right not a carb solenoid on the left, is that how the base engine is equipped?[B/]

No James. The 1971 Base Engine has a solenoid on the left, just like the 1971 LT1, and so does LS5 & LS6.

Who ever said the AIMs were perfect? The cars always give us the best answers for TFP, if we are able to look at enough original exampless.