Alternator Conversion

Hope this is some help for those wishing to convert a ECU controlled alternator to stand alone. I note a few have just used the start wire or a PWM to adjust the output.

I found this while trawling the net:https://www.st.com/en/automotive-analog-and-power/l9916.html

Cost me US$10 plus shipping from the US supplier in Texas.

The project is a the V6 swap into a very early 944. The swap has a aftermarket ECU which does not have all the facilities to fully operate these alternators.

The alternators on these engines also have an unusual mounting and I did not want to create a big lump of ally on the front and side of the motor to carry a self regulating model. I also wanted to upgrade to a 140 amp alternator to power the electric/hydraulic power steering and electric a/c.

I opened up the old 100 amp alternator to see what was involved in pulling it appart, re-assembling and  doing the wiring and it was not a big deal, 2 screw in connections, one connection to the case and one soldered connection to the second brush.

The original 2 wires are discarded.

I now have a regulated alternator using the original mountings which monitors battery state and have retained the ignition light.

Here are a couple of photos of the internals and how the wiring exits the case to the regulator. Re assembling is a problem until I read that you put a pin into the back of the unit to hold in the brushs. I am not sure the images will appear.

Cheers.

Jaffar,

Not something I need on my project but certainly an interesting topic!   Two pics posted just fine.

BTW...there is a "link" icon in the menu bar so you can post live links.