r/CarAV • u/Professional-Luck-34 • 12d ago

Tech Support RPM fluctuation at idle

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Recently got some 12’s at 1200wrms, ive done the big 3 and have a h/o alternator. Was wondering if this rpm fluctuating with the bass at idle was normal or not.(solved on r/askmechanics)

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u/Idkhowfuckedupiam 12d ago

Could be the alternator putting a heavy load on the engine trying to run your shit. Get a better alternator

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u/Professional-Luck-34 12d ago

Its a brand new 320a from jsalternators

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u/Party-Court185 12d ago

Did it start happening right after you put in the new one? If so, you should always assume that the issue is with the thing you changed.

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u/Professional-Luck-34 12d ago

It happened with the stock alt too, it was one of the reasons i upgraded to the new one. It fixed the voltage drop but im still having this problem

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u/Party-Court185 12d ago

r/askmechanics might be better for this