Originally Posted by
r5matt
No alarm,immobilisers or stereos fitted, I had them all removed as to eliminate them as probable causes.
I had motorzone perform a batt/alt test and the readings at the battery were pulsing 11's 12's 15's then on the 20's
If the voltage at the battery was pulsing from 11 to 20 as you said here when motorzone tested it then the voltage regulator in the alternator is duff and it will have fried the battery. It won't make any difference how old the battery is, that would kill a brand new battery. Looks like you need a new alternator and battery.