You should not have a problem like this... How long are you ground wire? Is it the same gauge as the power wire? They also make amp cooling fans that imo are a lot better than the crapy square ones that you might have. If you have raised you amp off of the floor that will help a lot or in my case it did. I sometimes leave my seat down because my monster amp produces a lot of heat and the air from the cabin really helps seeing how a trunk can get up to if not more than a 180 degrees in the summer. I think the fan would be a bit much... you might need to go with a bigger amp if it is getting this hot, and to tell you the truth running an amp turned all the way up is not a good idea generally running it at 3/4 way is best for the amp life on it. However I would check that the ground wire is as short as possible because the less it has to travel the better for operating efficiency. This is all i can really think of given the information, but the pump would be a fine place to run the wire for the fan. Do you have a good amount of power running to it? The amp may be getting hot due to the alternator going bad after the constant surging. Do you have a cap or a second battery? Without a good amount of power reserve the amp could be getting hot due to its inability to draw enough current to your speakers. All of these things play into the problem your having. A crossover might help your situatuion as well. It will be a great help to filtering out some of that rf noise your picking up. Ill keep an eye on this post to see if i can help you with anything.
First of all, those amp cooling fans are nothing but 12V fans, like PC fans. They just got a higher price tag, because you buy them at a hi-fi store.
Second, if your amp gets excessively hot, that might mean theres something wrong with it internally, amps generally should cool just fine, unless you case them into a small container.
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The amp may be getting hot due to the alternator going bad after the constant surging.
Wrong, if the voltage regulator works, the alternator wont produce any more current than the 14.4 or whatever its designed to do. Well within the limits of the power input levels for the amplified. If the voltage regulator has gone and it gives the amplifier too much current, you're going to blow fuses or damage the amp internally. But that would also be visible with other problems, such as your battery would quickly die out.
AS for the ground cable, as long as it has good ground and its of similar thickness to the power cable, shouldnt be an issue, thing dont get hot because the ground is bad, they work or dont work. What you hear if the grounding is bad is the whine from the alternator.
As for putting in a relay, run the relay so that you have the relay turning on from the remote wire and then take the power from the fan through that. Not the fuel pump.
any fan you wire into the same circuit as the amp is going to induce emi into the circuit, which you will hear in the speakers as a whine or static depending on how fast the fan is spinning. it's the same reason why you don't wire cat5 cable next to a power line; the power line induces a 120hz noise signal into the cat5 cable which seriously fucks up your network. the only way your gonna get around it is to shield the amp from the wire (aluminum foil around the fan wire... cheap but effective...), alternativly, you could sacrafice one of the air ducts in the car to cooling the amp, just don't accidentally turn the heat on, but i don't know if that would be good if you use ac or if you live in a humid climate...
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Originally Posted by REN69
OMGWTFBBQ!!! he must have typed it on his blackberry.
"Whenever cannibals are on the brink of starvation, Heaven, in its infinite mercy, sends them a fat missionary." -Oscar Wilde
Coming at this from an IT point of view, have you tried wrapping your fan wires around and through an RF choke? These are readily available at Radio Shack et al and cost about $5. Speaking of fans, if you're using a little 80mm fan (about 4" square) don't even bother, they don't move air worth beans. Pick yourself up a couple of 120mm computer fans, Panaflos are a good brand for high CFM, and wire those in. You'll lower noise and increase cooling. If that doesn't seem to work, a squirrel-cage blower pushes a LOT of air for a lousy 12 or 14V input.
My Ground wire is maybe 6 inches long. And it is the same size as my power wire.
I did fix the problem bu moving the ground directly from the amp, to the spot where the amp is grounded to.
My fan is from my dad's old server and is pretty big, it seems to move alot of air under the amp, since is has only one direction to flow.
The only problem that I have is that to mount the fan now so that it stays in place. I will take pictures when I am done and have everything mounted and secured so I can show you what I mean.
It is on the bottom of the air pushic cold air though a wooden channel.
What I did was got the amp hot, and found that the bottomw was hotter that the top(which doesn't make sense, because heat rises) So i put the fan flowing over the bottom.
If the top was hotter, I would have had the fan to flow over top.
Having a bigger fan moves more air... and if the alternator is gone bad or out... it does not provide a 14.4 volt current granted I understand where your coming from however I was talking about a different defect... Having the same size wire may not seem like it helps to you but run a 4400 watt amp and find it out yourself. I even took the liberty of calling up ma audio before i made any rash movement or Ideas.
That taken care of.
Putting the fan underneath the amp would be a good idea in order to keep it cool. Try running it 3/4 of the way on the amp itself and turning the head units subwoffer gain up to about 0 or 1 any more than that and the sound starts to distort. "This might be what you doing" If you like you can try to cut some of the backing out of the amp rack (directly under the amp) Just leave a bit of wood for the amp to still mount securly. This should not make the amp rack look any diffrent because the amp will be covering the hole or indention up. I have had a few kenwood amps and some of them seemed to stay farely warm to hot, and that was at running it at 3/4 of the way up. The amp may just run warm to hot. Try contacting kenwood if you havent done so already and see if this happens often on the model amp you have. I have found some of thier techs to be extremly helpful as far as amp placement and how to run it.
if you leave it the same and you put a noise reducer on the RCAs goin to the amp(it doesnt matter if its on the radio side or the amp side)then the whine should go away...cause it sound like what you have (what we call in the installation biz) engine noise...if you do that you should be all good in the hood
I fixed the fan noise 95% by moving the fan ground from the amp, to the chassis.
Also, for future reference, I would like to take time to have a small PSA:
When working with a car's eletrical systems, remember, always, ALWAYS unplug the battery.
This prevents you from having numb thumbs.
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