1990 325i auto to manual

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marcusberry26
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Sat May 04, 2019 10:36 pm

Have done the gearbox swap today and followed the wiring diagrams on here but none of them have the big thick black wire I have and what to do with it.
It plugged into the gearbox down near the back on the left side.
I have attached pictures.
Does anybody know what it it/does and what to do with it after a manual conversion.
Cheers.
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Brianmoooore
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Sun May 05, 2019 10:24 am

This was an EH auto. Part of the loom for the gearbox electronics, and no longer needed.
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marcusberry26
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Sun May 05, 2019 8:24 pm

Thanks for the reply. Out of interest what is an EH auto?
Thanks.
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Brianmoooore
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Sun May 05, 2019 8:28 pm

Electro hydraulic, AFAIK. - The ones with a rotary selector knob fitted on the centre console.
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JackCornick
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Sun May 19, 2019 6:29 pm

This is the reverse light switch isn’t it? When doing my manual swap I spliced an e36 connector on to this and plugged it in to the reverse switch on the manual box
You can't polish a turd, but you can paint it matte black

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marcusberry26
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Sun May 19, 2019 9:17 pm

I think it could be. My auto had manual kick down so I don’t think it was electronic version of gearbox and certainly did not have a rotary selector.
I’ll look further in to it. Thanks for your input.
Cheers.
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Brianmoooore
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Mon May 20, 2019 8:52 pm

The socket for the reverse lights on an E30 is found inside the cabin, just in front of where the gear lever is on a manual.
On an auto E30, the reverse light switch is mounted on the selector lever, inside the cabin, an connects to the reverse light socket by a loom a few inches long.
On a manual E30, the reverse light switch is fitted into the RH side of the gearbox, and connects to the socket in the cabin by a much longer loom, which runs along the fixed gear selector arm under the car, and then through the gear lever grommet into the cabin, where it plugs into the reverse light socket.
If you are doing an auto to manual swap on an E30, you will either have to obtain this loom along with the other bits, or make one up. Whether you use an E30 gearbox switch with simple 'lucar' connectors or an E36 switch with matching plug is irrelevant, but either way, the wire in the OP pic. isn't required, unless you decide to use it as the basis of a home made E30 manual reverse light switch loom.
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