do you have any car audio batteries or just the stock one?
I have two amps, about 1400rms total and with only one shuirken bt-20 I had very little voltage drop. I just recieved a bt45 also that im going to add in and I expect almost no voltage drop.
I was looking into this a few weeks ago also. When I browsed the web places said the oem one is 110-120. But I talked to singer alts and He checked his sources and he says our stock alt on the 2010 focus is a 150amp alt! I was going to order a HO also but he didn't have a case that would fit our model.
I've been looking at getting a HO one for my 2011. When I hit hard the RPM's drop noticeably or when I roll up the windows, turn on the lights, ect. the RPM's drop and I feel a little shake as well. I had ford check it while still under warranty and they said its fine. But now Im no longer under warranty, I dont want to get left stranded!
And I would not worry about this as mine did this even when I had taken my system out for a while. I would sit at stop lights and hit the window button just to the the rpms fluctuate lol
Does anyone know about the 2012's?? I would assume that all trims have the same alternator. I'm running about 900 watts rms and I get a slight dim at idle when I'm pushing it pretty hard. I'd bet a second battery would be easier but just some food for thought.
I dont feel like a need a HO alt anymore lol. My voltage at the amp is 14.5 at normal listening volume and the lowest I have got it to at full tilt and heavy bass notes is 13.9 lol
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