Alternator or battery? - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 12-10-2012 Thread Starter
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Alternator or battery?

So I have a quick question, I have had my optima yellow top for about 3 years now and I think it might have been used when I bought it. I'm wondering if it's going bad or I should get a new alternator. I have some bass in my car so of course that'll make everything dim. But it plays good for about 2-3 min then starts dimming everything. And also I can sit at night with my headlights on, if I press a window switch or something similar I can hear and see the rpms go down a little bit :?::?::?:. It'd that's good when the rpms go down by hitting a window switch or console light. Also sometimes it almost dies when I start it up. Start it gettin up to 1100 rpm then drops to 3-400.


[/SIGPIC]2001 mustang gt - accufab throttle body/plenum and intake spacer, airaid cold air intake, ram hdx stage 1 clutch, optima yellow top battery , 3.73 gears with fresh replacement of bearings, sr short throw shifter, much more to come .
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post #2 of 3 (permalink) Old 12-10-2012
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Sounds more like alternator. But, the only way to find out for sure is have them both tested. Honestly both could be bad - if the alternator is weak the battery has been taking up the slack. FWIW, Optima batteries don't live up to their hype or price tag anyway. Have it tested, replace if necessary (my hunch says 'yes') and go from there.



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And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #3 of 3 (permalink) Old 12-10-2012 Thread Starter
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Ty for your quick response cal you've always been there for me haha

[/SIGPIC]2001 mustang gt - accufab throttle body/plenum and intake spacer, airaid cold air intake, ram hdx stage 1 clutch, optima yellow top battery , 3.73 gears with fresh replacement of bearings, sr short throw shifter, much more to come .
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