my 1990 bronco 2 wont start. you can hear the fuel pump prime but there is a clicking noise when trying to start it. what could it be?
Sounds like the battery is too weak to crank the engine, and the starter solenoid is clicking. The battery can retain enough power to run small loads like the fuel pump, but as soon as the load of the starter hits, the voltage drops too low to even hold the solenoid, so it ends up clicking on and off.To confirm a weak battery will require measuring the voltage at rest, then while attempting to start it. If the voltage drops below 9.6v while attempting to start, the battery is too weak. Another way to test the weak battery theory is to attempt jump starting. If it starts right up, the weak battery is the reason for the no-start.