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RETIRED
Join Date: Jul 1999
Location: BOULDER Colorado
Posts: 39,412
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The LIGHT is part of the charging system. If it doesn't come on prior to starting the engine it's likely the BULB is burnt or there is an issue with the wirining TO the bulb......the bulb has to light up...then got out when the engine is running at the proper rpms to charge the battery.
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1983/3.6, backdate to long hood
2012 ML350 3.0 Turbo Diesel
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