DragStuff

My buddy Bruce (the other half of 2QuickNovas.com) has a MSD 6 BTM box. Its making a high pitched noise and he's also getting a lot of interference through the radio. Didn't do this before. The car has been sitting for a while and now has the noise issues.

I'm thinking possibly a bad ground. Anybody seen this before and know what the cure is?

Yes, my 7al would whine all the time. I bought it used but it never seen to hurt anything. I didn't have a radio in it so I can't comment on that, but MSD said it's a ground and/or noise issue. They sell the ground filters that's supposed to eliminate the feedback, but I don't know how well they work.

After you check the routing of the wiring and the connections, see if the power or the ground is sharing a connection with something else, sometimes the noise can bleed over from something else. On the late model GM stuff that still has a cap and rotor, 4.3, 5.7, etc. we get a lot of noise just before the cap and rotor burns through or a spark plug wire starts to short to ground.

Thanks for the info guys. I'll pass it along to him.

The ground should go to the battery

As said check the grounds.
Does it have a woven ground/braided also?

I don't know how he has his grounds run. He's a good friend but lives in Minnesota. I haven't seen the car since 2001.

Not sure if he's had a chance to look into it more or not. Over a foot of snow on the ground up there now he says, so I'm sure he's done playing for a few months.

Thanks.