Engine hum through speakers
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do you have aftermarket sparkplug wires? If so, that is probably where the engine noise is coming from. It could also be that the amps are picking up the noise through their grounds as well. If the amps chassis is screwed to any sheet metal in the car, try unbolting them first and see if the noise goes away. If that doesn't solve the problem try using an ipod or some other device w/ RCA outputs to temporarily hook up to the amps inputs and see if the noise goes away. If it goes away that way it is either a bad pair of RCA's or poor routing of the RCA cables. Contrary to popular belief, running your RCA's next to your power cable DOES NOT cause engine noise. Most engine noise enters through the ground path and well....you entire car is the ground path so good luck running RCA's along some path that is not a ground. You do need to watch out for noise emitting modules such as ABS, Airbag, ECU, TCU and any other onboard diagnostic type of electronic modules.
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Try thinking of your car as one big antenna and the stereo itself only servers to amplify what it recieves. One thing that everyone on here fails to cover is that the noise itself is usually generated from the alternator itself or other electrical motors such as the fan motor you speak of. It's the single most conductor and source of all noise in the electrical system. The brushes themselves are what actually generate the noise. Now, some alternators/motors seem to be more prone to this than others. But the way you take care of it stays the same. Like Chuck said, try the RCA's and grounds first (they seem to be the first to recieve the noise. He's also on to something when it coes to the spark plug wires.
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if i use an alternate source and hook it to the RCA's i get no noises at all. its defenitly coming from the HU.
also, the engine is COP.
i think im gonna power up the HU with a external battery and see if it goes away, if it does i guess ill rewire the power and ground coming into it
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slowvo wrote:
if i use an alternate source and hook it to the RCA's i get no noises at all. its defenitly coming from the HU.Are you running the alternate source down the same RCA cables as the deck is running on or are you just hooking up the new RCA's at the amp and unhooking the RCAs that the deck uses?
If you aren't using the same RCA's then it could be in the cables, if you are using the same RCA's it is almost definately in the deck.
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then it is probably the deck, try locating a new ground for it and/or ground the chassis of the deck to the same grounding spot that you are grounding the ground wire to.
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tjamz wrote:
then it is probably the deck, try locating a new ground for it and/or ground the chassis of the deck to the same grounding spot that you are grounding the ground wire to.QFT
I've found that those RCA cables with the ground wire in them is good for equalizing a ground loop.
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treimche wrote:
Just a thought here, it's possible that your amp is bad too. We actually just had a car come in at work and narrowed the problem down to a bad amplifier.Except that the noise goes away when he removes the deck and uses an alternate source to feed the amp.
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I gave him some advice..which should work if the supply to his deck really is the issue. He did find info on the net to back up my claims as well, heh. Putting a cap between the power and ground should get rid of any AC signals present. It does this by blocking any DC and allowing AC to go to ground. I guess maybe I did learn something in those stupid circuits classes?
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what happens if the faulty ground is coming from the antennae though nate? You still need to ground the chassis of the deck to the same spot as the ground of wire coming off the harness if that is the case. It could also be a poor ground internally on the deck from the circuit board to deck chassis. But yes, a cap will do as you stated if he does in fact have a dirty voltage supply coming to the deck.
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tjamz wrote:
what happens if the faulty ground is coming from the antennae though nate? You still need to ground the chassis of the deck to the same spot as the ground of wire coming off the harness if that is the case. It could also be a poor ground internally on the deck from the circuit board to deck chassis. But yes, a cap will do as you stated if he does in fact have a dirty voltage supply coming to the deck.That was the only problem I was trying to cure for him.
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hehe, I figured as much, but its in my nature to complicate things beyond necessity.
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Well, i changed the ground entirely, grounded the case, put in a capacitor between the pos and neg....hooked it up, and now the noise is only coming through the center and right speaker...
i remember with my old setup it was coming through the right speaker only.you were right, time for a new car!
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hmmm....that is odd to say the least, try swapping in someone elses deck and see if that works maybe??
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