I am in the process of trying to repair my son's '99 Blazer-LS, 4dr, 4WD that was swamped. I have begun cleaning the engine fuse block and I did not properly make a notation of the orientation of some of the relays. I thought that they would have been error proofed for installation, but they can be installed in 2 different positions, 180 degrees rotated. I would like to have a photo that clearly shows the proper orientation for reference so that I install these properly. Thanks for any assistance.

 

It does not matter. The 4 pin relays can be mounted in either orientation without impacting their operation. If your relays have a wiring diagram on them, you can see why.

 

Okay, I'll check it out. Thanks for your help.

 

I see now. The actual switch terminals (30-87) are diagonal.
Thanks again.

 

Yep. You got it.

 

You are definately more knowledgeable on Blazer repairs than I am, so I would like to ask you for more information related to my son's Blazer. It was submerged in a ditch on an angle (front end was about 15 to 20 degrees lower and the left side was about 25 degrees lower) with the water level higher toward the left front of the vehicle. The water just topped the engine. I drained the engine oil & removed the filter, removed the plugs and blew out the water (about 2 gal.). I installed new plugs, oil and filter. I have removed the fuel tank and checked for water contamination, but found no evidence. The fuel pump works and the vehicle starts, but only runs for a few seconds. This will be a long term project so I am not in a big hurry. My question for you at this point is what else should be drained and refilled. I have removed and cleaned all of the interior components including the IP. Nearly all of the electrical systems work. Some don't so I can always chase those later. My concern is water contamination and corrosion of tranny, diff, or tranfer case. What do you think? Thanks for any help.

 

Sounds like the PCM is shutting down the engine possibly due to a failing ignition switch.

As far as other things to drain/refill, I would service the front diff just in case it got water in it.

 

Thank you! I will look closely at the ignition switch and definitely change the frt dif.