Charge or replace the battery.
Low battery voltage .?
A loud fast clicking noise is usually indicative of a low battery or a loose cable.
If it is a single click, the problem is either a loose battery cable or a faulty starter relay/solenoid. If the symptom is rapid clicking, the battery is probaly low.
Probably it's a low battery, though it could be a bad starter. You are probably hearing the starter solenoid clicking.
check if your battery is low than usual ..might be alternator problem
Ford F-150 will not start all it does is make a clicking noise
A very low (but not quite dead) battery will do that. It's the starter relay trying to work.
Low battery is the most likely cause. You need to find out why the battery is low.
Low Battery
you most likely have low brake fluid or if it stops fine its just an annoying noise
The clicking noise is most likely relay chatter. If you turn the key and hear a clicking noise and the engine does not crank, this usually a sign of a low battery (or a short). Check the battery first. If the battery is good there may be a short in the electrical system. Start with the ignition switch. Remove the four screws on the bottom of the steering column. Then lift off the top half of the steering column. Inspect the wiring and try to tighten any loose connections. Make sure the pos. & neg. battery leads are in good order (especially the neg. lead.)
The most common reason for your 1999 Ford Ranger pickup truck not to start is a battery that needs to be charged. Charge the battery for a minimum of 15 minutes.