Re: Ford 500 - 2005 - The entire dash (all gauges) went...
There is a TSB (Tech Service Bulletin) from Ford on this. The 2005 Five Hundred and Merc Montego use the same instrument cluster which has been found to have issues. You need to get a new cluster and replace the old one. It is easy to replace. 5 screws if I remember correctly.
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You need to get an actual pressure test on the block to get an actual reading, because I would hate for you to have lubrication problems in the engine and blow the engine. If the gauge is stuck on zero try with the engine off and key on, ground the sending unit wire to the block and see if the gauge pegs to full. If it does not, replace the gauge and get it calibrated if it needs calibrating.
If it happens again, smack the top of the dash above the gauges with your hand. If the gauges come back on then remove the gauges and clean the plug contacts. This usually will restore proper operation. Some people actually put a slight bend in connectors to get a tighter fit...you can do that but don't get radical or it won't go back together.
It sounds like you may have a bad fuse distribution box problem due to the multiple electrical problems. Inspect the fuse box and look for any damages to the fuse box and wire harness, pay attention to the wire harness from the engine compartment to the cabin compartment, look for any damages and corrosion. Star with that to save you some money since time is money and the dealer will just take as much time as they can. Good luck and hope this help. Keep me posted, be glad to answer any questions you may have.
IT SURE SOUND TO ME LIKE YOU ARE MISSING A GROUND TO THESE GAUGES. THIS WILL BE TOUGH TO LOCATE WITHOUT A SCHEMATIC DRAWING TO HELP YOU. YOU MAY BE ABLE TO LOOK UNDER THE DASH FOR A LOOSE WIRE. YOU CAN ALSO CHECK THE FUSE PANEL FOR THE FUSE MARKED GAUGES TO SEE IF IT IS MAKING GOOD CONTACT. HOPE THIS HELPS. BEST OF LUCK. LET ME KNOW PLEASE. THANKS FOR USING FIX-YA!!!!!!!!!!!!
Don't overlook a loose connection in the wiring harness. Since the entire dashboard goes out, the plug on the harness may not be all the way in to make a good connection. I don't think that everything would go through 1 fuse. Some of the Dodge's used to have a master thermal fuse. This would kill power to almost everything when over amp'ed or ever heated. Good Luck