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Re: the 99 blazer with the problem
Yes, you will have to remove some external couples to actually get to what you need to replace but, yes. your in the right area. use that part number on the outside of the holding box to match up the chips you may need to replace.
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The only relay box I know of is in your glove compartment. Just went through changing a fuel pump in my 96 and finally located it in there. Dealer told me it was under the hood. Little black cover pops off and there are 3 relay's inside.
If your Blazer has push button 4wd check your fuse under the hood. and have some body listen to the black box on the side of your transfer case while you try shifting it into 4 hi and 4 low... if it doesnt make any noise its your shifting box.
There are a couple of fuses you will want to check. They are located in the under hood fuse box. The TBC ( truck body controller) and ATC (automatic transfer case) fuses.
If both are good, take the truck to your local Auto Zone and ask them to scan the vehicle for "trouble codes". Write the codes down and respond back.
Below is a diagram of the under hood fuse box and the fuse locations.
look under the car or behind the grill there should be a black cable running to the under side of hood.if you ''skin'' the black plastic back you will find a metal wire.now take two pairs of pliers.one to hold the black casing and one to pull the wire.that should open hood.once hood is open you'll see where cable attaches to hood latch.that cable needs replacing.
the relay is either located in the large fuze box under the hood, when u locate this fuze box open it and under the cover it will have a picture of where the relay is in the box, or its located on the fire wall under the hood on a rack with a couple of other relays. hope this is helpful please rate me