I recently buyed a 03 manual Z and after about a week i started to have problems..

in the same day ..BOTH windows motors died
The Dc plug between the seats wasnt working

But the problem that really P*** me off is sometime the speedometer fall at 0 and even the digital one. when it do this the abs and brake lights come on

I asked to the guy who have it before what could cause that and he said maybe when he install the jvc radio a wire went loose to a box behind the radio

I dont know a lot in electrical things in car so i have done several search and have'nt found anything regarding this problem

PS: Im french so im not verry good in english so please dont juge me

 

First off i would check all the fuses and work from there...

remove center dash and inspect his wiring........
http://liljerk.morpheus.net/350Z/dash_removal/

I recommend you get a friend or someone that knows a bit more about car electrical though to help you out...

WINDOW MOTOR:
https://my350z.com/forum/maintenance...t=window+motor

 

thanks jason ill try this tomorow