Engine whine after upgrading amp size?

[mrmex 10+ year member]

I recently installed a small system in my truck and had been runinng a small mtx rt2120(200wrms.) This was a temporary amp until i got a proper sized amp, an mtx 2400x (750 wrms.)

After installing this amp I now have loud whining and a pulsing low volume thump, like my subs are alive with heartbeat.

Ive seen the sticky above but with the situation here a figure the knowledgable can spot this one easy.

TIA

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[BreakingBad]

i had the same thing with my grand prix when i bought an alternator off ebay, same symptoms, but never after changing the amp.. it could be the quality of the amp, rca's, interference.. even ur alt..

 

[Prowler573 5,000+ posts]

I recently installed a small system in my truck and had been runinng a small mtx rt2120(200wrms.) This was a temporary amp until i got a proper sized amp, an mtx 2400x (750 wrms.)
After installing this amp I now have loud whining and a pulsing low volume thump, like my subs are alive with heartbeat.

Ive seen the sticky above but with the situation here a figure the knowledgable can spot this one easy.

TIA

Poor ground.

/story

 

[mrmex 10+ year member]

HA, should have just pm's you in the first place. I know i didnt scrape the paint clean, thats first. What about the wire length, its about 2 feet, no more. I read that 30' is the limit. Should i bother shortening it?

 

[jmoreno150 10+ year member]

like prowler said its most deff. ur ground bro sand the g round cleans it and star wash it down..

 

[SethPhillips 5,000+ posts]

as short as you possible can son!

 

[mrmex 10+ year member]

This **** whine is driving my nuts, will fix tomorrow, thanks guys!

 

[mrmex 10+ year member]

well.....did all the above and still got this crap!

I checked with magnet to see if steel, yes.

Shortened wire to one foot.

Sanded down paint.

WTF.... Bad ground in amp?