Check engine light comes on constantly nothing seems wrong

SOURCE: check engine light

I would say that your o2 sensors are faulty either the pre or the post . They must be intermitten so I would replace both

SOURCE: Lights work, but turn key and nothing except brake

check the fuse under the hood for your starter and if it is blown replace it however this is only a quick fix as I have just fixed this problem, after time you will continue to blow fuses and the problem is your starter. However check the fuse first and see if it is blown, if so replace try to start your car, if it starts have the starter checked as well as the ignition switch.

SOURCE: Light indicators on

look in dodge truck forum, search the web. it's probably a sensor that mounts on the rear "pumpkin". abs speed sensor

SOURCE: '99 dodge grand caravan, 3.3ltr, battery light

you should have 14.5 +/- with the AC on you might have a week regulator or week brushes in the Altenator . but not enough at this time to cause a no start . but do have the alt tested (Load tested) at a parts store .

SOURCE: Check gage light keeps coming on, but there seems

one gauge is tripping it on,
but you have to be fast enough to check gauges when it happens,it could be the fuel gauge going to empty,or the charging one going below 12 volts,or the oil gauge falling off at an idle,the temp gauge you should be able to catch that on if it was peaking