Alternator Wiring
 

Went to the local scrappy today and got a nice little alternator off of a Honda CRX:)

The only problem is i can't quite work out the terminal connections on it!



They are labeled on the sticker



Obviously the post goes to the alternator

IG - ignition live?

L - Live ?

FR - ?????

Here is the wiring for Honda using the 4pin Denso

L = Ignition lamp
IG - for Ignition switch protected by15A fuse
C - goes to computer then back out to ELD (Electric Load protector)
B - (recharge wire) goes to battery protected by 15A fuse
FR -goes to computer.

the numbers on alternator plug should be ;

1 = C
2 = IG
3 = L
4 = FR

Hopefully this can give you a basic idea, but since you do not have the Honda wiring on your ride, perhaps these Denso schematics applicable to Toyota can help in a vague way...:)
Just use the wires needed to connect to function, no need for the computer crap as per Honda.

Note that Honda engines turn counterclockwise, so the fan inside the alternator will run opposite to its intended direction. It might not be too much of a problem. I got a Hitachi alternator off a Nissan though.

thanks for that guys as for the fan we'll just have to see what happens ;)

I have a book here with all the plug layouts. The unmarked terminal on your picture is to the battery and shown as S a charge sensing wire, really important this one it stops the alternator cooking the battery . FR according to this book is field rectified, god knows what thats used for.

Bob

be careful with nippon alternators when shopping as there are some that are wired up a bit odd and need a relay to make them work .
nothing that cant be worked around but worth paying attension

Today it took me an hour or two to get my Hitachi alternator off a Nissan Sunny to charge. I even took it apart again to look for some obvious failures.
Apart from the charge cable, it's got two wires going out of it: L (dashboard charge light) and S (sense, ignition +). I hooked up the wires, but no voltage appeared on the BAT pin. I almost declared it dead, but tried switching the wires around. BAM! 43 volts on output! Turns out, I connected the dashboard light has to ground instead of the ignition +, that prevented the alternator from charging.