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The regulator is inside the alternator.
A std Jimny alt. have three pins where only two is used. The one with White / red is for the charge lamp in the dash and it is needed to get power from the alternator.
On some cars there is no charging if the lamp is broken but yours do not stop shining so there could be a broken connection for the alternator or the regulator is broken. The other middle pin is for the ignition power to the alt and the last connection is not used.
do check the positiv charge pin too, M6 on the orignal alt. And the thick wire must go all the way to the high power fuse (check it) on the battery. All connections should be firm and in no way loose. They may look ok but if you can wiggle them or there is any corrosion it is most likely not good enough.
Also check the ground connections, from the car to the battery and from the gearbox flange to the car. many places where corrosion or dirt or loose connectors can make problems.
Can be checked by having a starter cable from the engine lift eye or another good ground connection and the negative on the battery.
if the charging go up when you hook it up your ground is not OK.
Alternators require an "excitation" current which is normally provided from the ignition circuit so spinning a disconnected alternator will not test it.
If you ever see 16~18 volts (in fact anything over 15) you probably have a failed voltage regulator in the alternator.
The battery "state of charge" has the most impact on the system voltage, a "flat battery" will be under 12 volts, a fully charged battery will be over 14.
What you're really going to look for is the way the voltage changes - engine off you want to see between 12~13, when the engine is started, you want to see an increase in voltage by 1~2 volts, so between 13~14, anything different and there's a problem.
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