Is it my ground or something worse

[Beastums 10+ year member]

I have a SoundStorm EV4.400 powering 4 mtx tn653 in my 02 trailblazer. the amp sits under my seat. i was running these speakers unamped for a little while just fine until i put the amp and now i have quite a bit engine noise coming through the speakers. i have the ground running to a bolt on the section between the two doors and it is sanded down. i dont have a voltmeter to actually test it but ive moved the ground around a little but thats the best spot i can find . so my question is do you think i just need to find a better ground or bad hardware or what? im at a loss here.

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[Buck 5,000+ posts]

Alt wine can come from multiple sources. I want to see pics of where you grounded to.

 

[Beastums 10+ year member]

View attachment 26532963View attachment 26532964

Kinda messy but its there

 

[Buck 5,000+ posts]

What's the fusing on the amp and what size wire is that?

 

[Beastums 10+ year member]

the fuse is 1 x 15 amps and the wire is 8 gauge

 

[Buck 5,000+ posts]

Ok, the ground should be fine. You may try grounding all your rca's together, maybe even try a different ground location.

 

[Beastums 10+ year member]

grounding the rca's?

 

[jasonAz 10+ year member]

Where are the RCA's ran, do they run with any other bundle of wires or your power wire? What deck do you have? How high is your gain? Remember the gain is matched to the output voltage on your source unit.

 

[jasonAz 10+ year member]

Where are the RCA's ran, do they run with any other bundle of wires or your power wire? What deck do you have? How high is your gain? Remember the gain is matched to the output voltage on your source unit.

 

[Beastums 10+ year member]

The gains are about a 1/4 up. The speaker rcas run straight from the head unit to under the driver seat. The head unit is a JVC KW-HDR720.

 

[brooklynjoy2008 10+ year member]

Did you move ur ground? You also may have to ground your hu in a different spot. My moms car was like that and it took me forever to figure out.

 

[Beastums 10+ year member]

so along these lines, would it be a bad idea to just get a ground loop isolator? is that an unnecessary/wrong route to take?

 

[Flex68 10+ year member]

so along these lines, would it be a bad idea to just get a ground loop isolator? is that an unnecessary/wrong route to take?

I wouldn't suggest it. My train of thought is that doing this is addressing the symptom instead of locating/correcting the problem(s).

 

[Beastums 10+ year member]

alright so if its not already pretty obvious at this point im lost so how do i grounding my rcas or my headunit

 

[Below20hzonly 10+ year member]

wrap bare wire around all the rca outputs on the back of your deck(around the outer metal shield). then connect that wire to a screw on the HU or straight to a ground.