So, I have a "6 watt" in dash radio. I asked the dealer what wattage it uses = SIXTEEN !!!  ...Using the formula Watts = Amp x Voltage you can calculate amperage fo...
...s drag and go faster !!! ;) No, actually, I calculated all the amperage draws of the various items in...was pushing it far enough--
I've included a screenshot of my spreadsheet where you can see at idle, wi...