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TOPIC: 928 issues

928 issues 03 Mar 2015 11:19 #18046

Hello all; i am looking for info on my 928s and i am hoping someone can help
i have two wires brown and brown/white going to the rear door latch (brown is attached to the bottom of latch ) however i am not sure where the brown/white wire goes and what they both do...anyone?

Secondly my plastic battery cover has no foam attached and is cracked, any ideas on what to use to fix it would be most welcome?
:)
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928 issues 04 Mar 2015 08:15 #18047


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Brown wires are always ground (earth) wires. One end will go to the body or engine, and the other end will go to a device being grounded.
Brown/White wires are always switched ground wires. In this case, the brown/white wire turns on the interior lights when the hatch is opened.

Getting the interior lights to work as-designed is important.
Each light has three switch positions, either from a small switch on the light, or by rotating the light to one of three positions. The three positions are OFF, ON, and AUTOMATIC. When OFF, the light never comes on. When ON, the light never goes off (until the battery runs down!). When AUTOMATIC, the light comes on when either door or the hatch is opened, and goes off after closure.
There are two lights on the circuit that are not switchable. These are the small red warning lights in the edges of the doors. If one or more of the door/hatch switches are faulty and always on, you will usually find all of the interior lights turned OFF, and the little red lights always on, draining your battery.

The hatch switch is a common problem area. The brown wire to the switch is always grounded. When the hatch is open, the brown/white wire should be connected to the brown wire by the switch, turning on the interior lights.

Another common problem area is the light over the mirror. The power wire can short to the body very easily.

I'm not certain about the "plastic battery cover". The battery box should have a steel door covering the battery. Are you referring to the larger plastic cover over the spare tire well? This cover has taken different forms for different years. A common type is a contoured lid made of clear, internally-ribbed plastic. This cover doesn't have attached foam. Cracks are pretty common. A gentleman called Jerry Feather makes contoured covers from black thermoplastic that fit well. His business is "ReDesign by FEATHER". I really don't know whether Jerry is a club member.

This particular Forum is to introduce yourself. There are other forums for technical questions, etc., and you might get more answers by posting there.
Wally Plumley
928 Specialists
www.928gt.com
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928 issues 04 Mar 2015 08:33 #18048


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livingpictures wrote:
Hello all; i am looking for info on my 928s and i am hoping someone can help
i have two wires brown and brown/white going to the rear door latch (brown is attached to the bottom of latch ) however i am not sure where the brown/white wire goes and what they both do...anyone?

Secondly my plastic battery cover has no foam attached and is cracked, any ideas on what to use to fix it would be most welcome?
:)

This is from memory as I don't have a picture handy - the interior lights can be switched so that they are on constantly, come on with an open door, or are off - as with most cars. In the case of the 928 there are two ground wires. Ground is always brown, but a brown/white striped indicates a ground that is only available with an open door (door switch closed). If you study the light you will see power goes to one side, and the other side with the switch there are tabs for both grounds. The side the switch connects to in the door position takes the brown/white wire.
Last Edit: 04 Mar 2015 08:34 by martinss.
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928 issues 06 Mar 2015 01:00 #18049


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I wonder if this is what is happening to my '93... Has a hell of a drain and the interior lights have never beer right...
James
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928 issues 08 Mar 2015 10:23 #18067


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Not unusual. Start by seeing if you can make the lights work with either door - if they will work with one door, but not the other, may be a faulty door switch or a wiring problem. If you have one OFF and two ON positions on each light, check the hatch switch first. It is important to get the lights working correctly.
Wally Plumley
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www.928gt.com
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