Outer Limits 4x4 Board

the other night i was charging my battry and a couple of hours later i try to start the GQ and forgot the charger was still connected, aloth the nissan started things are gonne funny now

like when startedmy battry light and brake light is slightly on like really dim but when you put your foot on the gass a bit the lights go out
and i find my and my volts meter on the dash jumps to 16volts


is it possible iv fucked my alternator seen as i use the battery from the 60 seires and the same thing happens.
or what else have i stuffed

Sounds like you have popped a diode or two in the alternator

so this means a new alternator? or can it be fixed?

It can be fixed.

It's a pretty common problem, especially when people don't jump start vehicles properly. It won't cost you anything to get a quote from an auto lecky.