Loud buzzing tho speakers when engines running

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Loud buzzing tho speakers when engines running
#1
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Got a loud buzzing thu speakers but only when the engines running. It did it also in the estate but I thought it was a bad stereo earth. Running tho a give amp. It also gets louder with the engine revs.
TD04 11mm Sedan, now 2.1 vnt

Sedan Project http://306oc.co.uk/forum/thread-5763.html

Provence Dturbo Dead
Blaze 1.6 Dead
China 5dr '6 Death by cambelt failure
Matt White HDI estate Death by wiring
Sedan Dturbo aka triggers broom
Diablo estate Dturbo Living dead
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#2
Neaust told me it was noise in the speaker circuit from the injectors. Makes sense with it getting louder with engine revs. So yeh. Probably a bad earth?
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#3
On an XUD tho there shouldn't be any noise from injectors
TD04 11mm Sedan, now 2.1 vnt

Sedan Project http://306oc.co.uk/forum/thread-5763.html

Provence Dturbo Dead
Blaze 1.6 Dead
China 5dr '6 Death by cambelt failure
Matt White HDI estate Death by wiring
Sedan Dturbo aka triggers broom
Diablo estate Dturbo Living dead
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#4
Deffo a bad earth mate where you earthed the amp to?
[Image: image_zps45f2003b.jpg]

Team Doesn't own a 306
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#5
It can happen to any car mate, just a bad earth, try relocating the amp earth, can also b phono cable picking up a signal, I kno it sounds a lil odd but had it in an old car, moved the phonos and the buzzing stopped, hope u find the problem mate
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#6
Bad earth or shit RCA cable.
Doesnt even own a 306.
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#7
It's earthen the the isofix support bar same place as battery. Turned gain down and it stopped then i got a bringing noise and smoke from the amp but its still working ok :/ its a vibe a3

Gona try get another amp to try to see if it is the amp or not
TD04 11mm Sedan, now 2.1 vnt

Sedan Project http://306oc.co.uk/forum/thread-5763.html

Provence Dturbo Dead
Blaze 1.6 Dead
China 5dr '6 Death by cambelt failure
Matt White HDI estate Death by wiring
Sedan Dturbo aka triggers broom
Diablo estate Dturbo Living dead
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#8
It's picking up the poorly rectified DC output from the alternator...

[Image: psu_fullwave.png]

I'm fairly sure alternators work on full wave rectification, so this is what you're hearing.

You need a ground loop isolator.

http://compare.ebay.co.uk/like/170602063...80&ff14=66
(16-05-2016, 10:45 AM)Toms306 Wrote: Oh I don't care about the stripped threads lol, that's easily solved by hammering the bolt in. Wink
Nanstone GTD5 GT17S - XUD9TE
Volvo V50 D5 R-Design SE Sport - Daily cruise wagon.
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