I purchased a battery to a 1999 plymouth voyager sport. When I put the battery in the horn start blowing. I tried starting up the van it wouldnt start. What could be the problem? The windshield wipers came on but it wouldnt start.

TRY RESETTING IMMOBILIZER BY PUTTING THE IGNITION KEY IN THE IGNITION SWITCH.TURN KEY TO THE ON POSITION WITH ENGINE OFF UNTIL IMMOBILIZER WARNING LAMP ILLUMINATES FOR 3 SECONDS.THEN TURN OFF THE SWITCH THEN TRY TO START THE ENGINE.IF IMMOBILIZER IS OKAY.CHECK FOR A BLOWED 40 AMP STARTER FUSE OR YOU HAVE FAULTY STARTER RELAY.

Sounds like its the security system on the van, if you stick the key in the drivers door and turn it then it should fix the problem. hopefully this fixes it

Aftermarket alarm, do this look under the dash under teh steering column area and look for a little push button it should have a red or black button now this will be anywhere under that dash area, sounds more of a alarm problems a after market alarm ,when you find it push and crank at the same time,now if you belive its not there try this close the door and open the driver door with the key but have the windows rolled down and do that or if that dont start. let me know you may have to overide the ignition switch to start the vehicle