Why do I hear electrical current in the interior after my big 3?

[JaysonR 10+ year member]

So here's the deal. I installed my big 3, according to everything that the sticky said, using 1/0 gauge wire, and fused my alt + to my batt + with a 250 ANL fuse.

Now my car has trouble starting and I can hear electrical current from the interior. Every time I roll up my power windows, the sound gets louder and everytime I press the gas, the sound gets higher pitched.

This sound that I'm talking about kinda sounds like a supercharger but I know it's current because I can hear it when I use an accessory. What the heck is going on???

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[andy1234 10+ year member]

try re doing your grounds

 

[JaysonR 10+ year member]

would that affect my car starting as well?

 

[brad 10+ year member]

Possibly you created a grounp loop and it is affecting everything, never heard of anyhthing quite like this.