As suggested by others before, disconnect all fuses, should be two for the ECM, and two for the radio. If test light is still dim, remove the large red lead on the alternator.
One question nobody has asked, How old is the battery? If its OE (original equipment, aka '96), then time for replacement of battery.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...