1994 sedan regina, 254000 miles. I have been driving daughter's car due to dead battery.
Car starts and runs, volt meter says 14.2 volts. Occasionally, the srs light will pop on and the volt meter reads 11.5 volts. After considerable and constant banging on the dash, the srs light might go out and the volts will again read 14.2.
Where do I start?
I will add that I have yet to figure out how to remove the dash cluster??
Thanks in advance.

Thanks to all of you for your responses.

Are the alternator and brushes original?

We had two 740 alternators fail at the same mileage 215K.

Worn brushes can be intermittent.

Dear ricko,

Hope you're well. For the alternator to start charging, it needs a micro-jolt, supplied by a flow of current from a bulb (lamp) at the bottom of the instrument cluster. That lamp is the one, behind the plastic panel, with a "battery" symbol on it. If the bulb burns-out, the alternator won't charge. If the connection between the bulb and the alternator is disrupted, the alternator won't charge.

Before removing the instrument cluster, make sure the ignition is "off". It is a good idea to remove the negative battery cable clamp from the negative battery terminal. Make sure you have the radio code, so you can re-activate the radio.

To remove the black metal bezel, in front of the instrument cluster, insert the tip of a screw-driver into the small slot, just forward of the cluster's clear plastic faceplate. Push the screwdriver inward about 1/4" inch, and pull the screwdriver towards the front seats.

When you push inwards, you disengage a spring-clip that holds the bezel. When you pull the screwdriver towards the front seats, you pull the bezel away from the spring clip. It may take a few tries for you to master the "trick". Be patient: you'll get it done.

The cluster is held in place by for T-20 screws. It is useful to keep handy a small magnet, as the screws come loose, use the magnet to grab them.

When removing the cluster, remove the spring clips from the aluminum frame, which surrounds the cluster. The cluster fits snugly, but can be pulled out through the opening. The wiring harness may be stiff with age/cold. Pull gently: allow the wire bundles time to "relax". They been in that position for about 20 years!!

Hope this helps.

Yours faithfully,

Spook

This info from the FAQ's will tell you how to remove the cluster:
http://www.brickboard.com/FAQ/700-900/ElectricalInstruments.htm#940InstrumentClusterRemoval

The cluster trim ring can be difficult sometimes. The tool you use to push the spring steel tab back can actually hold the trim in place as you try to move it. Both sides are the same and you only need to release one. You might need to use a tool to get under the edge of the trim to pry it back as you push the spring tab in.

Randy