You need to check “all” the wires. Also make sure there is room for the speaker in the door. I sounds like the wires are not tight somewhere. I hate doing anything with the electrical system. It could be a bad speaker so if you do all the above and come up empty handed it has to be the speaker. Good luck.
I get older and they stay the same age.
[COLOR=red]RED JEEP #6[/COLOR]
91' YJ, D30 EZ, F8.8 locked & 410's, BDS4+" lift, 35" BFG's on 15x8 RC, 8,000lb Ramsey, etc. www. rock-nutz.com