Several things could be going on, so I will try to help, though more info is actually needed. The first thing that I can think of is if the battery is too weak the symptom may be that the engine does not actually spin over while trying to start the vehicle, but you will hear a rapid clicking noise coming from the starter relay when the key is turned to the start position. If this is not it, then I need to know more, like, does the engine actually spin over? is the clicking occurring with the key turned on or off? Stuff like that.
A clicking noise in the engine of a 91 Ranger could indicate a problem with the valves. A valve lifter in the engine may be worn or stuck.
Where is the clicking coming from? Within the engine compartment or inside the car?
That's the metal wall that divides the engine compartment from the passenger compartment
On a 1996 Ford Ranger : The blower motor resistor is in the engine compartment It is below and to the drivers side of the blower motor
engine compartment on the passenger side
On a 1995 Ford Ranger : The heater blower motor is in the ENGINE COMPARTMENT , near the firewall , on the passenger side of the engine
It is usually ( at least on a 2000 Ranger) locted on the blower motor housing in the engine compartment.
10 degrees BTDC - unless engine compartment decal shows different
The 1992 Ford Ranger ICM is located on the firewall in the engine compartment. The ICM will be on the drivers side of the firewall.
Relay # 6 is the ( starter relay ) in the Power Distribution Box , in the engine compartment of a 1998 Ford Ranger
check the relay
Should be bolted to the left fender.