[judgeman6970]

Originally Posted by jciwolf

The sensor on the right, passenger side, is a three wire unit /w green, black red tracer, and dark blue. Don't know where the dark blue goes, possibly signal wire??
I tried to get a hold of offenhauser but no luck, not even by phone. I believe it it a 360 degree model, asked Summit but they don't know either... they only sell them!!! Any help appreciated. Thanking everyone for their support and advice jciwolf

Wiring diagrams are available, "Chilton" makes manuals for these cars. These can even help with modified vehicles. Fyi, 47 yr old "modified" musclecars have to be repaired by qualified "old-skool" mechanics, or by "trial & error". Calling companies like summit & offenhauser isn't gonna help....

[jciwolf]

I have the manuals on this car and the wiring diagrams separate from the manuals. They still don't help. I am going wire for wire on this, also learning more than I thought I would but I'm retired Johnson Controls Senior Technician so used to wiring problems and researching wiring different from tech diagrams. I thank You for the advice though, trying to short cut the tracing if possible. jciwolf

[Held for Ransom]

Originally Posted by jciwolf

The sensor on the right, passenger side, is a three wire unit /w green, black red tracer, and dark blue. Don't know where the dark blue goes, possibly signal wire??
I tried to get a hold of offenhauser but no luck, not even by phone. I believe it it a 360 degree model, asked Summit but they don't know either... they only sell them!!! Any help appreciated. Thanking everyone for their support and advice jciwolf

Attached is a simple wiring diagram for the temp sensor and TCS.



Temp sensor (PS) and Rally Gauge temp. sensor (DS).



TCS vacuum solenoid (PS back).

Your Offenhauser manifold may have the PN cast on the bottom. Usually you can tell the style by the carb. opening. 360 is usually on the sides of the center.

[jciwolf]

I thank you for the help, however, my "70 GTO has the same wiring as the diagram you supplied but the dk blue wire goes to the distributor not the terminal block. I have an HEI distributor and it makes the wiring a bit different. I have opened the wire harness and have a dk blue, and two black wires cut off and taped. I have checked all three of these and no power period, I believe these are the original signal wires from the TCH and Auto trans solenoid. No TCS solenoid on the back of my power steering pump. I have power on the dk blue wire from Temp sending unit in acc mode. It drops power when turning the ignition on causing no spark. It seems like in start mode something opens up but have not found it yet. The mystery continues. Thanks again. jciwolf

[jciwolf]

I'll state what I have found out about this 1970 GTO. The previous owner head the original motor bored and stroke because the 455 head wanted to put in was damaged beyond repair. Instead of buying a new motor he had this motor bored and stroked, to 4.15 x 4.21. New crank , don't know what brand or #'. A Lunati cam, also don't have #'s either. All and all at the time of everything being done, he had himself a brand new motor with tons of items from Jegs, Flowmaster, and Stainless Steel Brakes Corp. Due to a lack of total motor knowledge, there is a multitude of unanswered questions I have. First there are no wiring diagrams of added parts and deleted parts, also some of these I have no idea what they are. For example, I have a sensor on the right side of the intake manifold,( passenger side), that is three wire and no idea how it is supposed to be wired in. Guessing 1 wire is power,(black with red tracer), 1 green possibly ground, and 1 dark blue think this may be signal but where does it go? So many more things, I have opened the harness and found cut wires and a lot of splices that are not factory and were done pretty bad. I am not really sure what the bore and stroke actually mean, but I have read the '70 GTO manual and it says the $55 motor has the same bore and stroke as the one has been machined to. Does this mean mine is now a 455? I received a reply to my wiring issues and am happy to receive it, thanks to Dennis. The engine size is a different question but involves the same car, and probably leads to my wiring problem, no updated wiring diagram.

[johnta1]

The dark blue wire from the intake fitting goes to the solenoid shown in HFR's pic on the back of the head, which controls the vacuum advance to the distributor.

What most people do is throw all that stuff away?
Unless doing a concours restoration?

That is an emission setup from the early stages of emission controls back in 1970.
(also basically to keep you from flooring it and running hard while cold)

As to the engine size that would be a 455 cid engine now.
Not sure what it originally started life as, but can be called a 455.

[jciwolf]

Thank You for the info, however I have an HEI distributor with the 12vdc terminal and the tach terminal. All the early TCS and Auto trans are gone and wiring is different. The Dark Blue from the temp sending unit now goes to the 12vdc terminal on the distributor. What used to work is not working now, I loose the voltage to the distributor causing no spark. Having no updated wiring diagram from the new work is making me go wire to wire to track where it loses voltage. I'm sure you would not have a problem with your background in racing, but this is my first muscle car wiring and restore to a drive. Learning though is frustrating but challenging and I take a challenge seriously. I think from this point on I will take pictures and look at the diagrams of the '70 originals and compare and change the diagrams to what is now on the car. OK enough for one night, I don't want to bore anyone more than I have. Thanks again jciwolf

[johnta1]

I don't think it's boring.

Trying to understand the situation.
With the HEI addition, I was wondering why the interest in getting the TCS working.

The blue wire should not be used to power anything I would say.
(plus it originally had no connection to making the distributor to work)

It's best to think of the wiring as sections.
If you need to work on the distributor, just concentrate on that section.
(which the TCS is not part of)

Basically the distributor (in your case) needs a switched 12 volts to make it work.
If it gets 12 volts with key on, then it should work.
Doesn't really matter where that 12 volts comes from but usually want it to be a dedicated wire.

As to the emission circuit, I'd just tape the ends up.
(since you don't have all the components)

Tell us what doesn't work and we could figure it out.

[johnta1]

Try this link for some wiring diagrams:

Wiring

[pggto]

I find these wiring diagrams very helpful.

http://www.ebay.com/itm/1970-70-Pont...hWXarb&vxp=mtr

With all the modifications that have been made to your harness and its age you might want to consider getting a new engine compartment harness that is set up for HEI. If i'm not mistaken the stock wiring harness has a resistor wire in the harness for the points ignition system and will not provide a full 12 volts to your distributor.

http://www.ebay.com/itm/HEI-engine-w...lTo5bS&vxp=mtr

[jciwolf]

I haven't looked at your diagram link but I will after this note. Today I checked three wiring diagrams, all with slightly different things and wiring. They did all point to the pink and black/wire from the ignition switch. I ran a new wire as the original is gone due to updates, to the distributor 12 vdc terminal, which only gives voltage with the ignition on. I put the car in acc and the wire had 12 volts, when I put the wire back on the distributor and tried to start it all voltage disappeared! If I wait a minute or two, now in shock, the voltage comes back, At this stage it was 7pm my time and time to roll it in. Saturday I will check for shorts, not sure if my distributor is a problem or my voltage regulator? Best way I know how is to disconnect the battery first and check for grounded wiring, by testing the + side to ground and then + to -. I will find it, just hoping it isn't something worth big $$$$$. Thank you again for your help, this is becoming an exciting and frustrating project. Now onto your diagrams jciwolf

[jciwolf]

Originally Posted by johnta1

Try this link for some wiring diagrams:

Wiring

"Excellent diagrams, they split the areas in concise portions! " jciwolf