Noise disturbance

[fabifoo]

I have recently installed a Pre-amp into my car audio system. All my amps are grounded to the car body. Now, i always experience noise disryption whenever i turn on my air-con when my unit is on. Worse more, the noise is exceptionally loud when i turn on my head lighs again at nite....i have tried changing the ground wires to bigger ones..still there is noise...so anyone with any idea???

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[Matador 10+ year member]

ddid u try changing ground to a diff location?

 

[fabifoo]

I din really try another location, but i did try changing a thicker wire so that the output current would be more...how can i attach it if i do not attach it to the car body ???? my fren suggested a direct ground from the amp to the batttery, no touching any car body...is theis the best way ????

 

[Matador 10+ year member]

just to chassis of car. shorter the better.