Jump to content
jfa.series1

Unknown Relay

Recommended Posts

I believe it has to do with turning on the second set of points under certain conditions, for cars that have two sets of points, like auto's. BE-5 in the 72 FSM shows the relay doing this job, but not its location. 

image.png

Edited by zKars

Share this post


Link to post
Share on other sites

Could it be an early version of a Neutral safety switch?

Share this post


Link to post
Share on other sites
2 hours ago, zKars said:

I believe it has to do with turning on the second set of points under certain conditions, for cars that have two sets of points, like auto's. BE-5 in the 72 FSM shows the relay doing this job, but not its location. 

image.png

Actually the location is shown in Figure BE-1. I don't think it's the thermotine relay. The FSM says that is located on the driver side fender well. 

image.png

Share this post


Link to post
Share on other sites

3 hours ago, jfa.series1 said:

Asking for a friend. The car is a '72 with automatic transmission. :Looking for an i.d. on the relay on the firewall. Thanks.

 

Jim, ask your friend to clean the wires and identify the colors of the wires/stripes. The FSM shows that there is something branching off the wiring going to the wiper motor, but it fails to say what that branch is going to.

image.png

Also, see if he can take a closer photo of the relay. I can't quite make out the part number.

And after searching the interwebs and digging through the wiring diagrams, I found the answer...on this website: https://www.classiczcars.com/forums/topic/36059-372-240z-automatic-transmission-what-part-hooks-to-this-connector/ 

 

Share this post


Link to post
Share on other sites

From the 73 FSM...since the prior year FSMs don't document this circuit worth a darn.

image.png

Share this post


Link to post
Share on other sites

My buddy's 73 has a different shaped relay in the same spot. I can't recall its function but we traced it in the harness and found it in a wiring diagram and determined it was not needed.

Share this post


Link to post
Share on other sites

The ones I have seen mounted there are more shaped like the horn relay long and skinny, not square like this one. 

It also had a short pig tail on it rather than the plug right on type like this one. 

I too was under the impression it was for the auto metic transmission models, possibly to do with the duel points. 

That relay looks like the one from under the dash on my ZX (pic) May have been changed out at some point?spacer.pngspacer.pngspacer.pngspacer.pngspacer.pngspacer.png

IMG_3350.jpg

IMG_3351.jpg

 

Edited by Terrapin Z

Share this post


Link to post
Share on other sites

The owner will be away from the car for a week but did have a closeup pic of the relay. I can get 25230-89918 and R3-11 visible #'s.  I noted there are two black/yellow and two green wires visible. Beginning to look like the diagram in @SteveJ post #7.

Jeff #2.jpg

Share this post


Link to post
Share on other sites

And the part number matches the part I was referencing.

Share this post


Link to post
Share on other sites

Here's a diagram from the 72 Emissions chapter. It shows a wire going directly to the distributor from the relay.    The ammeter they show is a separate one, for diagnostics, not the one in the car.

So, you could trace the wire back, or compare colors, or disconnect and test continuity.  Or a combination of those.  Or you could do a variation of the test as shown in the chapter, and see if the relay has an effect.

image.png

image.png

Share this post


Link to post
Share on other sites

Not the relay for the second set of points. That is near the front of the car. It's the relay for the inhibitor switch. The green wires go to the seat belt buzzer. One black/yellow wire is from the inhibitor switch. The other two black/yellow wires complete the circuit to power the starter solenoid. 

When the automatic transmission is in Park or Neutral, the contacts should be closed on the inhibitor switch. When the key is in ON or START, this energizes the relay called K-18. The contacts close on the starter solenoid circuit so that the car will start in the ON position.

  • Like 1

Share this post


Link to post
Share on other sites

I'm the guy with the question on this item. Thanks jfa and all who brought clarity to my inquiry! Unless this is one of those components that has extraordinary durability, I'm sure I'll have more questions later if I can find a replacement. By the way, it's a one owner car mine since new (72669). I put it in storage in 1983 and began a preservation project about 12 months ago.

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.