1994 Mercury Grand Marquis Q&A
1994 Mercury Grand Marquis Question: battery& alternator
Had problems with dash lites tail lights , changed light switch everything ok with lights but now the battery lite on dash stays on, battery checks ok. There was a burnt wire on light switch could that be the problem ? Had battery checked they said ok. alternator checked ok - dogjasper
Really need to inspect the wiring diagram for the dash. Does you battery stay charged? If so, then it is most likely an Instrument Cluster problem, something may be using the battery light circuit to create a false ground because its own ground is weak. It is called 'back feeding' or an 'unreported ground'. - dandd
When you replace your headlight switch on this car, you almost always need to replace the wiring connector, as it is likely melted from overheating. This may or may not be related to your battery light...but still should be inspected and repaired as necessary. Check the terminal and connector at the alternator for corrosion and overheating as well. Good luck. - DaveJHM
The battery light may illuminate on the instrument panel because the alternator wire harness connector is damaged. A new connector kit is available and should be installed to correct this concern.
new alternator (2-3 mo); new battery (installed today); new serpentine belt; new belt tensioner all changed today...but the battery light is still on (the red warning lig...
Okay I Want To Know Whats wrong with my car when my battery wont stay charged but the altenator is good and then it starts right up after a jump but if i turn it off for 30 mins or more the battery...
I have to re-charge my battery at least every other day, and it drains as i drive. I have already tried a battery change...and it made very little difference, the charge just lasts longer.
the battery light comes on while driving and then goes off, it never stays on for a long period of time