o4 grandmarquis ls battery drain

120

Asked by grandmarquislsford Apr 19, 2015 at 02:48 PM about the 2004 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

I have an o4 grand marquis ls and my battery keeps draining, I did a parasitic draw test and found out my battery is draing very fast however I pulled every fuse and found no fuse that would stop the drawing of power from battery. I also checked the ground and everything is good.  Any suggestions would be appreciated. Thanks

9 Answers

5,295

The alternator is one suspect, disconnect the power wire from it (the heavy one) and re-check. This is my specialty. If you hook up a 12v light bulb between the batt. pos and the car does it light up? If not, use a seat belt buzzer or such. It will buzz and drive you crazy, but then disconnect wiring harnesses and devices until it stops. I bet it's the alternator, I ran a cross a ford doing this. Disconnect all wires to it when testing. Bad diodes, or regulator inside.

5 people found this helpful.
120

I used a volt meter on battery ground and put the positive side on the wire harness part of alternator. I was reading 3.76 volts when car was in the off position. So, it must be the alternator trippmeister because their should be no draw from alternator when car is off. Thanks .

I'm having the same problem, replaced 2 alternators and 2 batteries had the same problem took it to the shoot they said my radio fuse was the draw so he took it out and still having the same

154,865

Hi CJ. This thread is 8 years old. Please start a new thread so everyone can see your question and be able to help. Jim

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