Electrical issue? I recently had to replace my positive wire on my batter due a break in the head from corrosion. after replacing my car would not crank anymore, my signal lights are flashing off and on when i put the key in ignition, and the little red light on my dashboard is blinking continueosly. any idea what could be the cause of this?

How hot ? not to be able to touch it ? Resistance (high resistance) causes heat. Lose connections, corrosions, wiring that has been open for a while. which caused green crusty (corrosion)Fuse / relay box has corrosion inside . Looking at wiring diagrams an using a volt ohmmeter to test electrical circuits is the way to a fix. You don't know that ,take it to a qualified repair shop.

not starting when hot indicates an electrical problem that comes from a component breaking down when hot.
Items that fall into this category are coils,coil packs, injector controls,injectors, ignition modules and fuel vaporization ( low fuel pressure from failing fuel pump/relay
I would leave the pump as an absolute last but would be looking at coil or ignition module. have you run the fault codes to check for other sensor problems such as cam/crank position sensors or immobiliser problems. All subject to heat affected problems.

Make sure that you have all the wires to the positive cable hooked up. It sounds like you've either had a wire that you've possibly left off, or a ground wire problem. Is there a power distribution box next to the battery? Check it for corrosion and at the banjo clamp at your battery for corrosion as well.

I also have a 91 S-10 and have recently had to replace my ICM i really think that it's due to high mileage and just wore out more than anything else

Sort of indicates the electrical distribution needs attention. Good that you replaced the battery and alternator but you still have an issue with some power loss, like wiggling wires restores connectivity. Start at the battery, use a wire brush, and some water mixed with baking soda if you see any green or powdery corrosion to dip your battery cable ends in. Usually the wire brush cleans well enough, you want all connections shiny metal to metal contact. Follow both cables and the splices or pigtails to where they connect, like that alternate positive post. The more you can remove, clean, and retighten all the connections you can, the more likely you wont have such gremlins reappear.

Rocker arm issues are common in that car. They can happen without any reason. This is not going to be cheap to look at. When the head was repaired it had to be removed. The timing chain might not have been properly tensioned. That would cause the timing chain to slip and then you have pistons slapping valves and spark plugs. This cause rocker arms and pushrods to bend or break and also can damage pistons.

More than likely the plug in has an issue. One of the wires could be broken or close to breaking in or near the plug. If the pug in and wire look good you may want to follow the wiring as far as you can and inspect it for damage.

I can't help with your Jeep but I have had a rash of similarly unrelated problems due to a bad or missing ground connection. When this happens (due to corrosion or repair by 'experts') currents flow wherever they must to complete an electrical path. These can be maddening and very tough to find unless the electrical diagrams have clear and very detailed markings that include the actual physical location of points at which several devices are collectively grounded to the chassis.

You'll find the glow plugs where spark plugs would be in a gasoline engine (in the cylinder heads).
The glow plugs will be smaller than spark plugs and, like a light bulb, will burn out and loose electrical continuity. You can check them in place with an ohm meter:
Remove the wire attached to the positive end and mesaure resistance to gound (engine block) through the plug. Unscrew failed glow plugs and install replacements. Carefully clean around the plugs prior to removal (to prevent dirt entering the engine) and apply the correct anti-seize compound to the threads of the new plugs where they screw into the heads. Be sure the wires are well connected without any corrosion or oxidation (no resistance).
Take your time and work carefully so as to avoid breaking or cross threading plugs. Do not wash the engine with water or detergent as the injector pump is delicate.

EGR position sensor circuit. Either you have a wiring issue or you need to replace EGR solenoid assembly. First check electrical connector at EGR solenoid for corrosion or broken wiring.