Quote:
Originally Posted by GSF1200S
I'm parroting the advice of others. Most people suggest turning it on for a period of time when the cable is disconnected; i would surmise it is either a signal to the pcm to clear fuel maps (and codes, etc), or somehow drains residual current stored in the vehicles electrical system. I would think however outside of possibly a few small capacitors in the pcm, there wouldnt be enough stored to require the headlights as a drain..
As long as the OP makes sure his fuel trims start from scratch, that's what matters.
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Touch battery terminals together while disconnected from batt...drains all power from any and all capacitors.