Not necessary too much power, noisy power, lots and lots of nasty spikes that will play havoc with the numerous ECUs.
An ex-colleague of mine spent thousands replacing the transmission in his Vauxhall Carlton (or was it a Senator?) it kept changing gear randomly, many £thousands later it was returned to him with the same fault. I told him to charge the battery, then unplug the alternator and take it for a drive - problem solved. The transmission's ECU couldn't handle the "dirty" power.