MP3Car.com - View Single Post - FAQ: Getting Rid of that Whine or Buzzing Noise in Your Speakers

Ko_deZ · 05-16-2007, 08:23 AM

Yes, those ARE good spots. There are several reasons for it. There is NOT paint inside the threads. Having that would be plain stupid, as the strength of the threads would be very poor, as well as them being broken every time you fasten/unfasten them. You do know what happens to your cars paint if you scratch a key along its side, right?

You will have to connect the ground to the metal parts of the car, that is true. There are some parts of the car that are not supposed to come loose in event of a crash, most notable is the seatbelt, and the seats. These are fastened in places that does not give in, and I can assure you that none of those places are disconnected from the chassis by using paint. That goes against all common sense.

Usually, if one want a good ground-connection, one removes paint to reveal bare metal on both sides of a metal plate, and put a bolt trough it, holding the whire. In a car, you have dozens of those places. Also, the you don't use a nut, but threads that are welded to the metal of the car, meaning that ever bit of thread helps to give a good grounding connection.

If you are still uncertain of how good the grounding is in the bolt, connect a multimeter and measure the resistance from the cars battery negative to the bolt that holdt the seat(-belt). Compare that to bare metal that you find somewhere.

Drilling a hole in the wrong place can give you condensing problems, and revealing bare metal in places that is supposed to be painted will run you the risk of rusting. Maybe not a big problem everywhere, but a unnessesary risk. I know a couple of professional audio builders (some that has won national DB drag championships, and they allway use the seat-belt bolt for grounding. It does not come much better than that.

-Ko_deZ-

05-16-2007, 08:23 AM	#25
Ko_deZ Newbie Join Date: Dec 2005 Posts: 10 My Photos: ()	Yes, those ARE good spots. There are several reasons for it. There is NOT paint inside the threads. Having that would be plain stupid, as the strength of the threads would be very poor, as well as them being broken every time you fasten/unfasten them. You do know what happens to your cars paint if you scratch a key along its side, right? You will have to connect the ground to the metal parts of the car, that is true. There are some parts of the car that are not supposed to come loose in event of a crash, most notable is the seatbelt, and the seats. These are fastened in places that does not give in, and I can assure you that none of those places are disconnected from the chassis by using paint. That goes against all common sense. Usually, if one want a good ground-connection, one removes paint to reveal bare metal on both sides of a metal plate, and put a bolt trough it, holding the whire. In a car, you have dozens of those places. Also, the you don't use a nut, but threads that are welded to the metal of the car, meaning that ever bit of thread helps to give a good grounding connection. If you are still uncertain of how good the grounding is in the bolt, connect a multimeter and measure the resistance from the cars battery negative to the bolt that holdt the seat(-belt). Compare that to bare metal that you find somewhere. Drilling a hole in the wrong place can give you condensing problems, and revealing bare metal in places that is supposed to be painted will run you the risk of rusting. Maybe not a big problem everywhere, but a unnessesary risk. I know a couple of professional audio builders (some that has won national DB drag championships, and they allway use the seat-belt bolt for grounding. It does not come much better than that. -Ko_deZ- Last edited by Ko_deZ : 05-16-2007 at 08:27 AM.