If my 2003 BA Ford Fairmont Ghia is left unused for about five days, the battery goes flat. I have disconnected the electric brake controller, checked for a drain from the alternator, also the glove box and boot lights. My auto electrician has checked it over and also replaced the battery, but all to no avail. Do you have any ideas?
The battery is being drained, so you need to trace the cause to be able to fix it. You have done the most obvious checks without finding it, but keep looking. If ultimately you can't find it you could install an isolator switch to the battery, which effectively disconnects it and should stop the problem.
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