Alternator Wiring

[james3004]

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!

http://img.photobucket.com/albums/v227/ZVHturbo18/Untitled.jpg

They are labeled on the sticker

http://img.photobucket.com/albums/v227/ZVHturbo18/0215.jpg

Obviously the post goes to the alternator

IG - ignition live?

L - Live ?

FR - ?????

[Wynand]

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.
http://img.photobucket.com/albums/v305/wynand/Denso1.gif
http://img.photobucket.com/albums/v305/wynand/Denso2.gif
http://img.photobucket.com/albums/v305/wynand/Denso3.gif

[alga]

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.

[james3004]

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

[robo]

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

[baz-r]

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

[alga]

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.