Manual trans is an M5OD-R1, just FYI
Easy shifting engine off, but hard shifting engine on means your hydraulic clutch system may have air in it and needs to be bled
There is a clutch fluid reservoir in the engine bay on the firewall, pull off the cap and pull out the "air cup" inside, look at fluid level, add fluid as needed
Google: Ford ranger clutch bleed
Parts stores can NOT test batteries or alternators, just FYI, they "may" test them but 50/50 chance of them being correct
Buy a Volt meter, under $20, worth its weight in gold
Test battery engine and key OFF
Select DC Volts on meter, and touch probes to battery posts, Red positive, black negative
12.8volt is a new battery
12.5v is a 3 year old battery
12.3v is a 5/6 year old battery and time to shop for battery sales
12.2v or lower is dying battery
Once you have YOUR battery voltage REMEMBER IT, exactly
Now with Red volt meter probe on battery positive, put black meter probe on alternators metal case, should show "battery volts" exactly
If not then you have a bad negative battery cable, clean or replace
With black probe still on alternators metal case move the red probe to the "B+" terminal on the back of alternator, the stud/nut terminal, should see battery voltage exactly, if not then blown MEGA fuse or corroded terminals
Unplug the 3 wire connector on the back of the alternator
Black still on alternator case
Red now on Yellow/white wire on 3 wire connector, should see battery volts exactly, if not then blown ALT SYS FUSE in engine fuse box, 30amp
Then test light green/red wire on 3 wire connector, should see 0 volts
Turn key on
Re-test light green wire, should now see battery volts, can be 0.3 less
And that's it, key off plug 3 wire connector back in
Look at the white jumper wire on 3 wire connector and make sure its not fray or disconnected
Start engine
Re-test battery
14.2-14.8volts is expected, if under 13volts then alternator is bad, period, if above 3 wire tested OK that is
Let engine idle for 5min
Retest battery voltage, should now be 13.5 to 13.9volts, under 14volts, voltage regulator is OK