85 cavalier headers glowing red hot after short trip.

Generally the indicator should glow green for the life of the battery unless it has drained or failed.

If you generally drive extremely short distances (under 15 minutes per trip) you could be draining the battery whenever you drive. This is a common problem in city cars. Otherwise it's possible something is faulty in the charging circuit.

After the MIL is turned off or the battery was disconnected for some time, all monitors are set to incomplete. However with several short trips with engine getting at least to hot enough for thermostat to open, (I believe 8 is the magic number of trips) most monitors are set, you may be able to pass the test with only one incomplete only.

prob a short in the wire

Swap the fuel pump relay with the A/C relay and see if the problem continues. the A/C relay and the fuel pump relay are the same. If it continues, the fuel pump may be getting overheated and will intermittently shut down. The CPS will certainly do something similar but you wouldn't have spark either.

You probably have a clogged up exhaust system building backpressure on the engine. Check your mufflers and catalytic convertors if you have them something is restricting the exhaust.

Might be a plugged catalitic converter.

Did you hear the one about the Terrano with a charging problem?
Just fix it by replacing the thermostat!
Seriously - check your temperature gauge does it take ages for the needle to barely get off cold? (and is the heater useless?)
The needle should get to just below half way in 2 or 3 minutes.
If the thermostat is stuck open, then the engine does not get up to temperature.
The glow plug control senses the engine temperature is cold, so the glow plugs stay on for an extended period of time (sometimes 10 to 15 minutes) - short trips particularly in winter, with more headlight driving - the alternator can't keep up with the current being drawn off and from time to time you will end up with a flat battery!
A thermostat is cheap, and easy to replace (three bolts and about a half litre of coolant - I pumped the coolant from the top of the radiator, and didn't spill a drop when the thermostat housing was removed).
Sure enough, as the engine temperature reached about 50C, the glow plugs turned off.

Have you checked your alternator?

the exhaust may have a blockage in it....maybe the cat converter....motors don't have power unless they can get rid of the exhaust.....

ck fuel pressure