Quote:
Originally Posted by 70zz4
thanks for the reply ,can you explain the process of getting rid of the external regulator? Thanks
|
It is quite simple, but first you have to decide whether to use the SI or the CS alternator. The SI alternator was used up until the late eighties and then GM went to the CS series.
If you use the SI alternator you will need to locate the brown wire on the end of the external regulator plug. You will need to extend it to the no.1 terminal on the SI alternator. Then you need to locate the red wire on the external regulator plug and extend it to the no.2 terminal on the SI alternator. Then just reconnect the large output wire to the back of the SI alternator.
Here is a picture with instructions.
The other two wires on the external regulator, the white and the blue one can be used to extend the brown and red wires or they can be removed from the harness.
One way to use the blue and white wires is to jump them in the plug like this.
the plugs on the alternators are different so you will need to adapt the wires to the SI alternator. The easy way to do this is to purchase the SI plug at any auto parts store for about $5.00 and splice the wires or get new terminal ends for the adapter and crimp them onto the brown and red wire extensions.
--------------------------------------------------------------------------
If you happen to have the alternator for the engine with the serpentine system and it is working OK, you can bolt it on and wire it to the same brown wire from the external regulator to the L terminal on the CS alternator. The red wire will extend to the S terminal on the CS alternator.
Some of the later years only use the brown wire in the alternator plug. I think it's after 1996.
The only thing that has to be done different is to solder a resistor inline with the brown wire before it gets plugged in to the CS alternator L terminal. This is done to protect the diodes inside the alternator internal regulator.
You can buy an adapter plug from the auto parts stores with the resistor installed and the right plugs to go from the old stock alternator to the new CS style for about $ 30.00 but if you have the CS harness you can just splice in the brown and red wire to the CS harness wires that connect to the L and S terminals. Just be sure to solder in a resistor in the brown wire. the resistor value can be anywhere from 85 ohm 5 watt to 300 ohm 1 watt to protect the regulator in the CS alternator.
Here is an adapter to go from the SI alternator to the CS and yours would have the older 10 DN plug on one end.
You can find these stock CS harnesses in any junkyard to plug into the CS alternators.
Any questions just post them up.