hey guys my blazer isnt starting as of 2 days ago its the 4.3L FI when i go to start the car it doesnt even turn over i hear 1 click come from under the hood but its not the sound of turning over cant figure out the problem any help or suggestions would be great work ive done within the last 2 years consists or fuel pump, cat convert, new radiator , starter, heater core, cap rotor and wires and a few other small things im sure so any help would be great thanks

 

It's either your battery (voltage too low) or your starter. Sounds like the starter solenoid is engaging (the click) but not the starter drive.

Test your battery first.

 

ok well just got tested its good its also a newish battery i was told possibly the ignition switch could that be it???

 

When the key is turned in the ignition switch to the start position, or the start button is pushed, electricity flows from the batteries to the starter solenoid.

Some vehicles are equipped with a neutral safety switch. If the vehicle is in gear when the key is turned, the neutral safety switch blocks the signal to the batteries, so the engine doesn't start cranking. Otherwise, the vehicle could jump forward or backward when the key is turned.

1. Battery charge. A battery having a low / poor state of charge will place abnormal stresses on the starting system. When measuring battery voltage, make sure voltage is 12.4 V or greater.

2. Excessive heat. A starter motor can become damaged if it operates too long at high temperatures. Excessive heat is generally due to continuous engagement of the starter. Damage to starting system components can occur when the starter motor is cranked for long periods (often due to cold weather starts, improperly tuned engine, etc.). Starter should operate for 30 seconds maximum then let to cool down for 2 minutes.

3. Excessive vibration. If starting system components are poorly or loosely mounted to the vehicle�s engine, the resulting vibration can damage sensitive internal components.

4. Corrosion, dirt, and dust. Starting system components operate less efficiently when corrosion forms or dirt particles build up around wire and cable connection points. Corroded and dirty connection points impair the flow of electrical current.

5. Improper use of starting fluid. Overuse and / or extended use of starting fluid places abnormal stresses on starting system components.

6. Defective solenoid. If the starter fails to engage or fails to stay engaged, the pull-in or hold-in coil may be defective, or the wiring to the solenoid is bad. You need to check the wiring to the solenoid. If the wiring is ok then the coil is defective and you will have to replace the solenoid.


You should begin by determining whether the problem is in the ignition switch, push button, pilot relay and associated wiring or if it's in the solenoid and starter motor.
We'll begin with the ignition switch circuit. Connect a voltmeter between the ignition switch terminal of the starter solenoid and ground see Figure 18. Have someone attempt to crank the engine and record the voltage. You'll get either no voltage, low voltage, or normal voltage, with slow cranking or no cranking at all.

First, troubleshoot the switch circuit. You can test it by connecting a remote start switch between the battery positive and the switch terminal on the starter solenoid. When you close the switch, the starter should engage and start the engine. Again, record the voltage while cranking and compare it to your first reading. A difference of less than one volt is not enough to indicate a problem. If there is a difference of more than one volt, however, then there is a problem in the switch circuit.

Try to start your truck from the starter, If you do not know how to do this take a screw driver or u can buy a remote starter switch from a parts store.
Take the only two wires that are connected to the starter and make it so they connect to each other using a screw driver or hook a remote switch to them.
if the starter turns then you know its your switch. if it clicks then you have a bad solenoid.

check all your power wires and batter terminals.