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Discussion Starter #1
I have a 2003 focus zx3 with 75,000 miles on it. I drive to work very early in the morning when it is dark outside. I notice the headlights and instrument panel dim then brighten the whole trip to work. Its almost like they are flashing. The alternator was replaced 2 years ago. The battery light only came on once for a moment in the last few months that this problem has been occuring. I had a good mechanic look at it, but he didnt find the problem. Any ideas on what could be causing this? Thanks.
 

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GreyRice WOoT!
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10,786 Posts
could search on this board for the big 3 upgrade, its a diy type of thing, getsa better ground on the chassis alt and battery, and should resolve issue. also your battery may be geting weak, and if u have a system every time it hits a hard note it drains the battery
 

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Discussion Starter #3
The battery had some corrosion on the positive terminal, I cleaned it and will test it this weekend.
 
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