I've read a bunch of threads and can't figure out what I have going on. I look at the wiring diagrams and I still am not sure what I need to connect.

1. According to the wiring diagram, I should have a WB wire running to the original 3-wire plug, and all I need to do is connect that to the upper terminal on the alternator. Well, I don't have a WB wire in that plug. I have BY, YB and Y. Looking at the diagrams, it looks like I should use the YB since it connects to the F tab on the alternator, and that's what the WB runs to in the diagram. Correct?

2. I don't care whether the stock voltmeter works. I installed an Equus guage set last week. So I can skip the lower connector off the s4 alt. Yes?

 

ditch them all stock alternator wires and just locate a 12-V when the engine is running and connect it to the S4 alternator's F terminal as shown below. disregard the hanging wire as I did it for illustration purposes.

I will wait for others to post on the volt meter connection for the hell of it. .

 

Thanks, wacky. I think I can manage that. I saw you said that before, but I wanted to try to use the existing wiring. I'll just grab one of the switched 12v wires and connect to it.

As far as I can tell, there's no reason at all to worry about the voltmeter. It's close to useless in the SA.

 

PM kgray. He's done the swap in his SA, iirc.

 

Ok, here's the summary. I drew a picture to help explain. Car is SA, engine harness is SA. Removed SA alternator. Installed S4 alternator. 2-wire plug from other harness is fastened to new alternator. Per wacky's advice, I used switched 12v wire for connection to R terminal (choke switch wiring for now). Per other instructions, I disconnected the wiring from the external regulator and used two jumpers to connect 2 sets of wires at the regulator connector. Following a suggestion I saw on a couple other sites, I've run a wire directly from the B terminal to the + battery terminal in addition to the wire from the B terminal to the fuse box (2nd gen). Seemed reasonable at the time.

Now I see nearly 14v at idle on an Equus voltmeter connected to a switched 12v feed to the radio. Turning lights on drops voltage slightly. Turning fan to lowest setting drops voltage reading to about 13v, maybe a little lower.

I'm almost certain I have this connected up correctly. Looking for confirmation. Also wondering if the voltage readings are appropriate.

 

you wired it correctly. Thats how I did my RX-3's.

 

thanks, man. i owe you a heine or three.

 

I will be waiting in your next SS trip.

 

Everything on the car works, voltmeter, dummy lights when necessary...oops, the TII is different...never mind......all the numbers are for a final write-up to close an old thread...disregard them

 

i just tossed the 70 amp and called it good. plugs right in