E30 Stereo help!

[_ethrty-Andy_ 2122]

Yes i need to ask an E30 question lol

1991 Facelift E30 Cab

Premium Audio Package

An aftermarket stereo has been fitted at some stage quite possibly from new, but its an old unit, it is a Sherwood unit.

Anyways, luckily the car side of the factory wiring plug isn't molested at all.

But on the radio side it has this filter on the power line as shown in the photo below.

Now i haven't swapped a headunit on an E30 with the premium audio package before

Now i do know what the filter does, but should I reuse this filter again when I put the new headunit in, or is it likely to be built into all modern units?

It has no BMW roundle or part numbers etc on it, so i assume it came as part of the Sherwood unit.

Just want to confirm!

Thanks team

[_ethrty-Andy_ 2122]

whoops here are the photos

[e30ftw 396]

Going by where it sits on the loom, it's part of the Sherwood unit's loom and the connectors sit after it, so I'd imagine you just dump that part and attach connectors from the new headunit to the end to use that white plug again.

Then again I have no idea what the filter does

[Ahmedsinc 414]

I was under the impression noise filters are introduced to compensate for crappy HU earthing? Have seen them on installs before but never as part of the manufacturers loom.

Bang the new unit in, if it hums then set up the filter

[E30 325i Rag-Top 2915]

^^ x2 try without, if it picks up some interference then chuck it back on.