2001 Alpine Coach alternator replacement.

[SteveS]

Chillwill - Your problem reminded me of something I forgot to mention about the DR change-out. I had the same problem and saw that voltage was being fed back into the ignition circuit from the alternator so I put a diode in series with the IG line. That fixed the problem and has been working great ever since. Voltage was being fed back into the IG circuit, through the internal windings of the alternator. The diode blocked the feedback when the ignition was turned off and the engine would then shut down.

Sorry I forgot about this until you reminded me of the shut-down problem. I just used a 1 amp diode in series with the IG line.

[chillwill]

Steve from everything I've reading about the DR, you don't connect the ignition wire. Tape it up and sat it aside. Now is this true or not. And im not understading the diode process. Thanks

Originally Posted by SteveS

Chillwill - Your problem reminded me of something I forgot to mention about the DR change-out. I had the same problem and saw that voltage was being fed back into the ignition circuit from the alternator so I put a diode in series with the IG line. That fixed the problem and has been working great ever since. Voltage was being fed back into the IG circuit, through the internal windings of the alternator. The diode blocked the feedback when the ignition was turned off and the engine would then shut down.

Sorry I forgot about this until you reminded me of the shut-down problem. I just used a 1 amp diode in series with the IG line.

[SteveS]

Chillwill - Perhaps you don't need to connect the IG wire. I did and that is why I had to insert a diode. If I remember correctly, and I think I am remembering correctly, that my alternator had to have an excitation voltage on the IG line to get the alternator to charge. Therefore the IG wire had to be installed. However, with it installed, internal feedback through the alternator was getting fed back into the IG line when the IG switch was turned off, supplying voltage to the ECU and keeping the engine running. The diode stopped the feedback and when the switch was turned off the ECU lost power and the engine would turn off.

This is the best of my recollection. I will have to review the schematics and look at the alternator connections again to confirm what I just said. The RV is not at my home at the moment and I cannot get to it for a couple weeks. Also, the schematics are in it so it will be a little while before I can confirm what I did.