19-06-2019, 08:17 AM
Tony
If you use an insulated socket then it doesn't matter as you are just providing a 6v potential difference across the lighter socket. The earth of the socket then simply becomes -6V and in practical terms 0 to the sat nav, and the 'positive earth' of the A7 is providing a potential difference of +6V.
That's why you must use an insulated socket so that you don't put 6v positive from the A7 bodywork to the earth of the socket/sat nav.
As i noted, some have previously noted an initial voltage surge due to the lack of any voltage regulation which can damage the sat nav, but I have not experienced any problems in 10 years.
Andy
If you use an insulated socket then it doesn't matter as you are just providing a 6v potential difference across the lighter socket. The earth of the socket then simply becomes -6V and in practical terms 0 to the sat nav, and the 'positive earth' of the A7 is providing a potential difference of +6V.
That's why you must use an insulated socket so that you don't put 6v positive from the A7 bodywork to the earth of the socket/sat nav.
As i noted, some have previously noted an initial voltage surge due to the lack of any voltage regulation which can damage the sat nav, but I have not experienced any problems in 10 years.
Andy
Enjoy yourself, it's later than you think!