The thing you should not do is remove the battery cables while the engine is running. The battery acts as a load and assists in regulating the voltage and amperage. An unregulated power source can be deadly for any elecronics in the vehicle, ECU ring a bell?
Running an alternator open and then applying load may produce sparks/spikes and blow the regulator or diode bridge not to mention posibility of battery exploson.
Maybe your friend will help with the repair bills when you folow his advice......
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92 Ford Explorer, 450k
97 Ford Explorer, 360k
99 Tracker, 4dr, 4x4, 2L DOHC, auto 165k
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