Has anyone had electrical issues with both cold-starting and jumping a 2002 S10?

Battery most likely fading away. check connections to chassis, starter, and engine ground strap. Got a multimeter? Now a good time to use one. Look for a voltage drop between starter and battery, engine and firewall, chassis and battery. Look at the resting voltage of the battery. 12.6 or higher? after it sat all night is it still 12.6 volts or higher? If it is 12.5 volts or lower, battery is weak.

Not sure you will care, but if you can find a battery shop that replaces or sells battery acid, you could recondition the battery. Harbor Freight Tools sells a battery treatment which is a Cadmium methyl-silicate solution. You dump out the old acid, fill and drain it twice with distilled water, then fill it with new acid and add some of the VCX solution, which will eat the oxide buildup off the plates and keep it dissolved while you do a slow charge. You can drain and refill it again or leave it in there, either way, you should see a nice fat 12.7 volts or better after you give it that first 24 hour slow charge. I kept batteries going for 12-14 years with that trick, and one bottle of the VCX lasted me through 11 cars and about 15 years. No clue what it costs these days, I bought the last bottle 10 years ago.

Either the battery is not holding a charge, or there is something on the truck that uses too much power when the key is off. You can connect a test light to the battery and pull fuses until it goes out (with the key off of course) to find what it is. Of course somethings like the radio preset memory and digital clock will always use some power, but it should never be enough to drain the battery.

Sounds like a weak battery. I would test and replace the battery (if necessary). Also if you decide to jump the car, make sure you use good jumper cables, and not those cheap 10$ cables. They're not made to transfer enough current to jump start a car in cold temperatures.

check the starter could be wore bushings and draining the battery the cold only amplifies the problem, could be battery maybe a new heavy duty with more cold cranking amps is needed, my guess is starter when all else has failed

No

Brain tumors run in my family so I was making sure those weren't signs. You're really immature

I don't know the answer to your question, but you suck . You were quite rude on answering my question. We need less quick witted smart asses in this world and more intellectual , understanding, and kind people .

man, you are a moron! did I spell that right? even if I didn't I am sure you know what I am talking about since you are an adult and all adults know when they are a moron.

New battery fixed it. Now on my second Optima (different vehicles).

Thanks everyone for the input.

nobody wants to help you so bye