hey peeps my bfriend has just hooked up 2 12 inch thermos on my 5ltr calais he has put all power and earths threw a relay but after the thermos are run for not even 5seconds the car stops charging,we have dissconected the batery while the caris running it still runs, however if we then turn the thermmos on again it dont charge it chews the battery within 2seconds,,, runs and charges without thermos on,, turn on thermos turn car of try to start again and nothing please help
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Sounds like you might have to invest in a 120amp alternator (standard is only 85amps). Note that it's not recommended to run a car without the battery connected. As well as providing a storage for electrical power the battery smooths out any electrical spikes that could damage your ECU and other electrical devices.
that sounds like it could work lol but in the mean time we have taken the twins of and am currently running 1 15inch wich seems to be working as the battery hasnt gone flat again..kindly thanking you for your help