I am learning and currently not good with wiring diagrams.
I have a 4.3L Chevy V6 TBI in my 1985 Toyota (been building it frame up for 9 years).
Finally got it to run however it is not charging. It has a brand new Yellow Top and Alternator.

I have resistance from the alternator terminal to the battery so I am thinking it is the exciter.
With the truck running, I am not getting an volts on the excited. Is it suppose to read 12v?

It is just a single wire on the harness. It is black or brown. The wiring diagrams I have seen seem to say it goes to the instrument cluster, however it seems like it is going to the computer.
https://photos.app.goo.gl/5jrhALtLVRFzQfFE3
https://photos.app.goo.gl/a89BSuyjh4aBxS2A3

Anyone have any experience with this? I need to trace and see where it is not connected.

Thanks,
Leon

 

https://goo.gl/images/A6nFA2

Looks like it should be wired to an ingition on wire not to cluster light.

I didn't wire mine this way, I spliced to yota harness so runs as stock alt did.

 

O.P.,
We just had some discussion about GM alt on this forum. Please search.
Also, best if you indicated exactly what model / pn alternator you have. Toyota parts alone are confusing. Adding Chevy / GM parts make it more so.

 

Here is pic of the new alternator: https://photos.app.goo.gl/Rv79qz6RemYjNyaL2

 

Do any of you know if the wire goes through the GM computer first and then to the ignition?
It looks like it is going to the computer, however I really don't want to have to remove all the wire housing to trace it if I don't have to.

 

Repeat:

 

I won't think alt is connected to computer, but not a GM guru. As it just needs to be excited from a power wire, if you don't run a switched on wire it will have a parasitic draw all the time when ignition is off.

I doubt that remanufactured unit is a true "one wire" so if your not going to use a remote sense (best configuration) then you will need to run a jumper from power wire to sense wire/port on plug.

 

Sorry, was the pic no sufficient?
I got it from O'Reilly. https://www.oreillyauto.com/detail/u...0?q=Alternator

 

Thanks for the reply. Can you go more in depth about this? Do I need to get a "true" one wire alternator? What is the one wire suppose to read on a multimeter when the vehicle is one?

Leon Ross

 

https://www.motor.com/magazine-summa...arging-system/

Just read first couple - 6 paragraphs. I was wrong about connecting to computer. Think it'll explain better than I can as I was only concerned about wiring CS130 into toyota charging system. Have seen guys set up the 1-wire setup on a stock type alternator but only ran 1-wire by accident, I have a true dual purpose 1-wire or OEM type alternator.

 

Neither pics nor OReilly info show which pins are which.

IF it's same as this...

...

Then wiring would be this:

 

The alternator I have has 4 pins on it. The plug has 4 slots but only 1 wire. (see first post's pictures)

 

Need to ID pin-outs.
Which are:
IG= excitation?
S= Sense/feedback?
L=charge fault light?
If we knew model like I showed above, we'd know pin-outs.
Those pics don't mean a thing. Those pics do not tell us what model alternator.
You need to do more homework.

 

Dude! I am doing my best to give what is needed!
Obviously I don't know where to find the model number. I thought the numbers on the alternator were a model number.
I also thought posting the O'Reilly's link the actual alternator would be good enough also.

Don't tell me to do more homework when I have obviously been trying to give you everything you have been asking for.
Instead, tell me where I can find the model number or just remove yourself from this thread.

 

For all the others that actually want to help,
I think this is the wiring digram. I could be wrong though.

https://ww2.justanswer.com/uploads/J...010504_gen.gif

Anyone willing to help me decipher the diagram in light of the first 2 pictures I posted (first post)?

 

WOAH!
Guys, perhaps I should hibernate ? LOL!

Then you have to do your homework
Here’s how you learn…

This may be how your alternator would be wired…




However, which pin on your O-Reilly alternator is “F”, and which one is “L”?
No one knows your O’Reilly alternator better than the manufacturer, or O'Reilly - not forum members, so your homework is… ask manufacturer/visit manufacturer website for documentation that will show you;

 

RAD brings up some good points. Can even be supported in article I posted. As reman companies try to cut cost a remans alt may not have all the features as the original CS130. That is Alt you have.

There is several methods to wire a CS130: 1-wire, sense with charge light, with PCM..... there are more and each has its pro's and con's. The option is really up to you to decide. If your not a read up and make an informed decision type of guy well then......

What makes things even harder is only you may know how your engine swap is set up. Even more in that direction is what are capability of items used in the swap. Unfortunately this is the challenge of modifying vehicles.

Article I sent you spells out a quick way to check alt with a simple test light. Give it a go. I would say pick a method of wiring alt so that it charges battery correctly for the electrical components you are wanting alt to support also take into account battery charging correctly.

 

I did order a test light. Waiting for it to come in. I will let you know what goes on.

I guess where I am getting confused in all of this is that I have an alternator and a plug from the harness that fit together. The plug has one wire. It doesn't have 2 or 4. It has one. and the plug fits.
I thought that just figuring out where the other end of that wire ends up would hopefully do the trick.

 

I think this is the wiring diagram for my ECM and harness. I don't see Alternator in this picture. Am I missing something?
GM Wiring Diagram

Here is an album of more pictures of everything:
https://photos.app.goo.gl/TQvDlykN5ZoHDzOp2

 

Been watching your post on pirate too. Interesting to see difference in post from a yota only forum and a mixed make forum.