2004 Mercury Marquis GS
10

Asked by jrtel59 Mar 02, 2019 at 06:28 PM about the 2004 Mercury Grand Marquis GS

Question type: Maintenance & Repair

26 seconds after I crank up, battery light comes on.  Already replaced battery
and alternator both of which now test fine.  What's next

3 Answers
41,945

Auto_Centric answered 5 years ago

Use a multi meter to check alternator output to battery terminals while running 14.3+ OK if not start checking all wiring, loose, corroded, voltage drops etc. ALL ground wires are suspect. Of course you've checked all fuses first.

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10

jrtel59 answered 5 years ago

Had alternator tested while light was off and while light was on. Alternator test good and battery tested good both ways

Mark helpful

Your Answer:

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