02 Pt Cruiser "No Fuse" Issue

make sure the battery is charging, make sure the alternator is putting out correct amp/volts, check cable connections of battery - at both ends, check connections of harness at back side of fuse boxes, check harness connection block at firewall (both sides of firewall)
, check harness connections leading up into underside of dash.
Ensure all ground connections are tight and not broken.

You will need multimeter and probe tool with light.

First off we need to know if it is a factory or aftermarket alarm. Plus, whether you have a fob or not won't make the alarm malfunction. If I were to venture a guess you have an aftermarket alarm that has gone around the bend. But if it is a factory unit then defective door switches (the ones that turn off the dome lights when the door is closed) could be the problem. Also there could be a problem with the power door locks themselves but not real likely. The body module could have issues in the security section, again not real likely. Usually problems like this are found in bad grounds, switches, intermittent power feeds, or something similar. Even if one of the door jamb switches is just loose and able to shift around could cause weird things to happen. And don't forget the switches under the hood and trunk lid. You can try each door switch by just pushing it in and out and wiggling it around with your finger to see if it has a short or bad ground. If it does the dome light will go on and off as you wiggle the plunger and that may be your problem. Good luck. Intermittent electrical problems are the hardest ones to find.

Had my daughter's 02 PT cruiser doing that, intermittant start issue. Checked battery, starter and they were good so replaced the start solenoid that is in fuse box under the hood. Have not had an issue since (1 year).

its probably the key alarm the lock cylinder may need to be replaced

CHECK THE DOOR LOCKS FUSE.

battery of car is zapped of energy...not sure if alarm system to blame, after driving it for a few minutes..clock and radio display lights turn off, horn can barely be heard...sometimes, motor shuts down completely. have had to put in 2 new batteries in just a matter of 2 months?...any idea what this may be?

I have a 2002 and one day had no headlight or dash lights. The tail lights, blinkers and hazards work just fine as do the radio of dome lights. Changed the multi-function and checked all fuses, but no help. I am interested in the solutions as well.

now sometimes this happens to let you know that one of the doors are open
check your doors
this is the only thing i can think of altho you have most likely checked it lol
also lock the car with the key
you don't want it to get stolen

If there is a switch on the dome light, that may be your problem. You would need to remove the assembly and check for voltage coming into the switch using a voltmeter with the door open.

make sure than the car has not any aftermarket alarm installed if it does have it remove it