Battery light and egr valve light is on on 1986 Mazda b2200 why?

Answer 1

The best explanation for the battery light staying on is the battery may be losing it's charge due to either age/dead cell/wear.Also I suggest checking and cleaning your batteries terminals and the follow the ground wire to the fender and down to the subframe to the block and remove at each point and clean and reinstall.I would check the voltage after doing this at the battery with the truck OFF and it should show at least 12.5 volts average.With the truck running it should be at least 13.0volts if not it could be the alternator is going bad and can be bench tested (removed from vehicle) at auto zone or advance auto or just take the truck to either store and let them do a charging/voltage check with a machine for free which will specify the problem if you do not have the meter or tools to do it.I would still clean the terminals and even clean the alternator terminals (note remove the ground wire on the battery) to do this.Now the egr light has a simple correction.On the driver side at the kick panel(at the hood latch) look up laying down and look at the wiring harness above.Next look for a single wire brown in color that should be connected to a single wire that is brown/white.What you have to do is disconnect the brown wire and move to connect to the green wire(may look black) and that should clear the egr light on the dash being ON.If it comes on again later miles down the line switch the two wires back to as the were.I suggest removing the egr valve 3 ten mm bolts,one vac line,one electrical hook up and note the metal gasket position this is imperative.Clean the egr with carburetor cleaner and a toothbrush and even sandpaper a good cordless brush and remove the carbon buildup.I at times have used brake cleaner works better.This should clear the egr issue unless the egr rubber diaphragm is deteriorated and losing vacumm.You can see the rubber seal make sure it is not cracked or holes in it.Egr valves are not cheap for these trucks even today (rough cost 140.00 new) even at auto zone,napa etc.