Thread: w124 Diagnostics questions "Check Engine Light"
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  #12  
Old 08-01-2009, 08:56 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
The test terminal has to be from the chart I sent you to.

Test the tool:

On the bat , place the red on + and the odd on -
Led should lite

Red on + and Blk on -
Led should lite ONLY when sw is ON
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