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Stereo cuts out
#1
So recently my stereo has a tendancy to cut out on loud bass hits during songs, and if it doesn't cut outh the headunit display will dim. This usually happens when the car is old or if the engine is off but I have the radio on. Is this a problem with my headunit or battery? My alternator is brand new but this was happening before I replaced that.
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#2
Do you have a sub and an amp? What exactly cuts out?

What about it usually happenens when the car is old?

If your headunit is the problem, and it cuts out when the speakers hit a bass note, that could be a number of things. The first I would be thinking about is that the speakers are bottoming out, and causing a short. The second thing it could be is a issue with the headunit itself.

A couple things to think about:

A) Where is the headunit wired into? Does it have a decent sized power wire, and is it on a dedicated circuit?

B) What voltage is present at the head unit power wire?

C) Am I pushing the speakers to hard?

When you run the radio with the car not running, your running off the battery. Now batteries operate around 12.5 volts, versus the high 13 to mid 14 volts that would be present when the car is running. If you have a bad battery, its possible that it would only be providing high 11 volts to the headunit, which would cause problems. Considering a battery has more then enough capacitance for just a 50 to 60 watt headunit, I don't think the battery is the issue unless its low on voltage. My guess is that if its not the speakers shorting out, then its a problem of power. Try rewiring the power wire to the headunit drirectly off the battery (with a fuse inline). The other critical part is to rewire the ground wire, and make damn sure its a good ground. A bad ground can also cause problems like you have mentioned

If you rewire the headunit, and its getting 12.5 volts with the car shut off, has decent power wire size and grounding, then its either a failure of something inside the heaunit or your just driving the speakers too hard. Its to bad you don't live close, because I could hook the headunit up to my test bench, and find out if its that for sure. since that isn't the case youw ill just have to do more work Tongue
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#3
No subs or amp, the headunit is like a 5 year old jvc one and I think it's 40x4 hooked up to 4 6.5" infinity refrence speakers. I'm not sure what the power is hooked up to because when I got the car it had an aftermarket headunit in it(pos tape deck) so when I wired in the new headunit I just used the adapter harness hooked into the stock harness. I think I might just end up pulling everything out and wireing the headunit up right to the stock harness, guess that means I'm gonna have to pull out the ole' haynes manual.

Battery is brand new, like two months old.
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#4
Quote:40x4
that would be peak power, actuall rms wattage is probably 50 to 70 watts total for all 4 channels.. Which isn't hardly anything, and shouldn't be an issue for most wiring. Like I said though, run a dedicated power wire to the amp (10 or 12 guage) and redo the ground. If you still have issues at that point, its either the headunit is going bad, or the speakers are bottoming/shorting out.
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#5
So I took the headunit out(talk about a fucking job in itself!) and redid all of the connections, originally they were just twisted together and taped so I took them apart and soldered them together and then taped over that. I also went and got a wiring diagram for the stock harness and made sure everything was wired up correctly, and it was.

Put everything back together and no more cutting out, so I'm happy :-D It was also a great way to kill 2 hours I would have otherwise spent sitting around being bored.
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#6
Good work young grasshopper Big Grin
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