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kalamykid
kalamykid, Shop Owner/ Tech
Category: Mercury
Satisfied Customers: 3984
Experience:  I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
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2 weeks ago my battery light came on while driving then I

Customer Question

2 weeks ago my battery light came on while driving then I lost the radio and dash lights..eventually it died completely. Took it to a shop I thought it was the alternator However they told me it was the battery..they put a new one in. We'll now today my battery light is coming on again. I don't know what it would be..I know I was told I had a coil pack out could that be part of it?
JA: Have you checked the fuses? The dashboard bulbs?
Customer: No, I don't really know much of anything about vehicles
JA: What is the model/year of your Mercury?
Customer: 06 mountaineer premier
JA: Are you fixing your Mountaineer yourself? What have you tried so far?
Customer: Just replaced the battery. The shop said it wasn't the alternator
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 5 months ago.
Category: Mercury
Expert:  kalamykid replied 5 months ago.

The alternator has to be the problem. If the alternator is good the truck will still run with out the battery connected. Most often the brushes will wear down and not make contact with the armature inside the alternator. The when it has a chance to cool off the brushes will again make contact and the alternator can test good. The coil pack can cause a miss fire, but not a drain on the battery or alternator.