Hmmmm, I haven't heard that before but I know the SES light for my LT1 messing up the alternator if there isn't a resistor in line. LEDs in general don't have much or any resistance so if it is required to keep the PCM out of limp mode, then you'll have to get a load resistor in there some where.
I'd be interested to hear a reason behind this if it is indeed true.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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