Diesel Place banner

Alternator issues

1537 Views 25 Replies 6 Participants Last post by  JMJNet
I ordered a new alternator for my 97 2 door Tahoe and it was different than the one I took out. A previous owner changed the plug and put a 200 amp alternator in. I also have a 94 2door diesel Blazer. The alternator in it matches the new one I bought. Also the alternator in the 94 is on the opposite side of the motor. Is this right? Are the serpentine belts different between a 94 and 97?
  • Like
Reactions: 1
21 - 26 of 26 Posts
Look for this connector where I described in the previous post.
Usually under the coolant crossover.
If there it should have BRN & WHT wires.
Trace the 4 wire harness in your photos and find where it goes.
No telling what has been done.

Camera accessory Auto part Plastic Cameras & optics Font
See less See more
  • Like
Reactions: 1
I cannot believe I found the connector you are talking about. I started pulling on harnesses and it was tucked down under the AC unit not plugged into anything. Brown and white wires. The 4 wire harness in my picture goes back to the firewall and across the firewall to the driver's side and then down behind the fuse box. From there, I am not sure. So I can splice my CS 130D at this connector and my Alternator should work. You are the man.
You need to find the ends of the 4 wires to determine what the PO was doing.
Then they need to be removed and any other changes corrected.
You could damage your new alternator, damage the gauge cluster,
have a harness melt down and even a fire.
The 2 wires on the OEM conn. you found go straight to the gauge cluster
with no splices or other connectors.
  • Like
Reactions: 1
It was some kind of service vehicle. It has a backup bell and may have had some equipment wired in. That may be why the old alternator was such a high amp one.
Those are hard to troublshoot since it is not stock setup.
21 - 26 of 26 Posts