2 questions

[kingsleysurf]

I just put in my system... it sounds good that has nothing to do with the problem... well it does. Anyway when i turn on my system and i get outside my car there is alittle vibration nothing all that big but if you walk around to the passnger side and stand by the rear tire there is a really loud nocking sound like someone is hitting it from the inside... but on the drivers side it doesnt do it... also i have a handsfree cellphone thing in my car and i plug it into my cigaret lighter and when i turn off my car it stays on... When i had my old explorer i think i left it in and it ran down my battery luckly the car started back up, i figured that was the problem... Any ideas on how i could stop that from happening... any sugestions would be nice

 

[Alec]

The audio thing just sounds like one of your speakers is causing the vibration.

As for the cellphone thing, the cig lighter power is not ignition controlled. It's live all the time. My suggestion is to insert a relay into the cig lighter leads and switch the relay with an ignition controlled power wire.

Simply put, run a splice of wire from an ignition controlled fuse through the relay which still gets power from the factory power wires.

 

[MONMIX]

Or just unplug you cell when you shut of your truck =)