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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.
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.
2001 GT Convertible
All the usual bolt-ons 1967 Coupe
200 I6, C4