1990 lincoln continental v6

Hello, in regards to your problem, I believe the switch in the trunk is for disabling the Air suspension system, but I could be wrong, I don't have schematics in front of me. If nothing works in your car, at all, such as lights, or any of the interior systems. Sounds like you have a wiring issue, with you battery terminals, to and from the unit. If every thing in your interior works fine, but your engine does not start, then the problem could be your PCM relay, Anti-them relay, starter interrupt relay, starter relay, or fuel pump relay, in that order, I believe. If this does not answer your problem, please provide some more details for your situation. Thank you, Alfredo

There is a switch in the trunk, drivers side, near the ride control on/off switch. It's a small round red button, and, I believe that it needs to be out for the fuel pump to be on, but you can try it both ways...

Before you replace your battery your car runs?if is running you must knock out some wire when you put a battery,check it if you have gas coming in and do you have spark