Re: Which of the 3 relays located in the glove box is the...
The relay closest to the driver's side is the fuel pump relay. The middle relay is the horn relay. All three relays are exactly the same. So, you can switch two of them to see if they both work or not.
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IF THE MOTOR WILL START WHEN YOU JUMP START, THE BATTERY IN THE BLAZER MUST BE LOW. USE A D.C. VOLTMETER, THE VOLTAGE AT THE BATTERY WITHOUT JUMPER CABLES, SHOULD NOT DROP BELOW 9 VOLTS WHEN THE STARTER IS TURNING. THERE IS A CRANK FUSE IN THE INTERIOR FUSEBOX. & A STARTER RELAY UNDER THE HOOD. BUT IF THE STARTER IS TURNING, THOSE ITEMS ARE WORKING. THEY ARE ONLY TO MAKE THE STARTER TURN. GOOD LUCK, DRVOLT.
The fuel pump relay in my blazer is located in the rear of the glove box which means you have to clean out all of the maps and other junk to get to it. There is a plastic cover that has to be removed to expose the relay which is the right side of the two present.
You can tell if it is operating when you turn the ignition key to "ON", the relay will click and you should hear a humming sound as the fuel pump energizes.
When you go to start the engine you are actually sending power from the ignition switch through a 20 amp fuse [crank fuse] then through the Park/Nuetral safety start switch and finally to the starter relay [located at the center rear of the engine compartment] This relay then sends a more powerful current flow down to the starter solenoid located on top of the the starter which then closes and allows full battery voltage from the large battery cable to energize and spin the starter. I don't think I've ever had to replace a starter relay on these but have replaced a large number of starters with bad solenoids and bad Park/nuetral switches. The "crank" fuse could also be bad but that is also pretty rare.
The starter relay is in the engine compartment close to the battery. Its a black or gray box 4" x 4" and may say relays or nothing at all. Lift the cover and get owners manual for exact location inside the box.
Hello starryconstr: My name is Roger and I can answer your question. The location of the fuel pump relay is behind the glove box. Once you remove the glove box you will see a relay panel. This should be a 3 relay panel. The relay on the left side should be the fuel pump relay. Please rate the quality of this answer as this is how we know you have received the information you wanted. Thank You for using FixYa. Roger
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