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So that you get a little confidence in what you are going to attempt, please go to your auto supply store and get a copy of the Haynes '99 Jeep Cherokee service manual. It has everything in it to help you. Don't panic...take it slow!
you need code scan vechicle if check engine light is turning on.many things cause vechicle surge while driving like faulty tps sensor, faulty mass air flow sensor.clogged fuel filter,faulty egr valve, faulty torque converter clutch solenoid. best code scan vechicle save time and money from guessing.
with an ohm meter check if the wires going to the relay have power when they should. next use a jumper wire from the pos. battery terminal to the power connector on the fan if the fan starts to run off the jumper then its probably the relay to blame. hope this helps.
The problem sounds intermittent, if you put volt meter on the battery while it is at that 19volt mark/reading(on the gauge cluster) you will be able to see if it is true. If your alternator is really charging over 16volts the lights should be getting brighter then usual and/or they are burning out. Find out ASAP, if the alternator has a defective voltage regulator, it needs to be replaced. Prolong use will damage components.