check for bad batt. just yesterday wifes o4 pacifica won't start.no crank.jump started and noticed dash and int lights dimming and getting bright.put voltmeter across bat and voltage jumping 1 1/2 volts.shut off and connected jumper cables.still jumping.replaced bat and started all normal.

On Jeeps, they run a lot of wires into the door on the drivers side, and over time, those wires break. Might be a place to check, although the only thing you have said that might point there is using the window, and getting warning lights in the dash. It might be a similar problem with Dodges.

How about adding a couple new grounds to rule out the existing ones? I'd run a new one from the block or head to the firewall, and one from the firewall to the dash and/or steering column. I'd also clean the contact points for any electrical component that mounts to any sheet metal in the engine compartment to insure they also have good grounds. Can't have too many grounds...

Digging through the factory diagrams it looks like all in-cab electrical stuff grounds through the body of the healight switch.

I fiddled around with it this weekend. The fuse box has three buss bars in it. One of them runs the door locks and A/C. Both are high amperage consumers. There was enough voltage at the bus to turn on a trouble light.
I pulled the fuse (circuit breaker actually) for the windows and jumped power from another bus bar to the output side of the fuse. The windows worked fine and did not turn on the trouble lights.
This tells me that it's an amperage supply issue and not a ground.
I will have to go through the power supply and bulkhead connector to look for issues. I'm strongly considering replacing the fusible links with fuses.

I guess I'll go through everything while the dash is out. Put the blower motor on a relay, replace the fusible links with fuses, and improve the dash lighting.

Think before replacing the fusible links with fuses because the fuses won't be able to deal with the spikes that links will. The starting draw on some of the acessoties is higher than the fuse ratings.

Looking at the gauge of wires they used a 30 amp fuse should work. If it presents an issue I can switch to drop in 30 amp circuit breakers.

There are three fusible links going into the fuse block. I planned on replacing each of them with a fused lead. If I put the blower motor on a relay for high speed it will take a big load off the fuse block. They are known to melt fuses and fuse blocks. My headlamps are already on relays.

i agree probable ground problem...pull off the ground at the body and sand it or grind it clean...TIGHTENING A GROUND ISNT GOOD ENOUGH! also test the alternator..maybe a diode is leaking back.. do this before you go any further on the high voltage relays etc.. dan

I've gone through the grounds, alternator, and battery.

It's got to be the power source. A bad ground wouldn't suddenly get better when you supply a new power source.