Power

[william30b]

in my car a hyundai i10 is a 5v supply on my dash to supply a phone via a hyundai docking unit. I have adapted it to accept my tom tom go 500. but will not charge the battery when exhausted. I then supplied the docking unit via a cigarette socket for more amps I am told. this way still won't charge the Sat nav. but I only used basic 2 core cable. baffled because power is present at the unit tested with meter any help gratefull regards bill

 

[canderson]

Your Hyundai will likely only be able to supply 500mA from the port up by the front ash tray. That's insufficient for both charge and concurrent operation of a GO 500. If your i10 is recent enough, there may be one inside the center console, and that one is capable of more current.

That said, a decent cig adapter should have covered it nicely. It does make me wonder either about the charging cable or the battery in your 500.

I'd first try to locate a different cable. Beyond that, you may be in for a battery replacement. It is now probably 10-11 years old. Do you have a mains charger you can use to test it that way -- before we get to talking about battery replacements?