Is there a print out or picture of where all the relay locations are for the 1991?

 

 

You may or may not have all 4 relays. I have 3.

 

THANKS! Is the auto shut down relay the fuel pump relay? I was having trouble starting the truck intermittently, changed out that relay, and now it starts every time.

 

The fuel pump is controlled by the ASD along with other things.

 

Well, I can tell you that that relay was the problem. It went intermittent, and it stopped me from being able to get the truck started about every 4th time I jumped in the truck. I figured it out when I opened the hood, tapped on the three relays and it fired right up. When it happened again I tapped on each separately till it fired up and guess which one I had to tap on to get it to start?

 

so did you finally replace it and solve your problem?

 

What does the part throttle unlock relay do

And can this be posted in the sticky

Good info

 

i have tons of pictures that should be posted in the diy sticky but i have never got around to it.
these are just the ones that i have labled
https://picasaweb.google.com/Hammond...eat=directlink

 

Me? Yes indeed! I had about 5 compatible Bosch 4 prong relays configured the same was pin wise and just swapped one in and it was all good! ANY bosch type 4 prong relay wired right will work in that application.