Re: E34 rear interior lights

[Eric Raquette <eric.raquette@xxxxxxxxxxxxxxx>]

> They have three wires as opposed to the existing 
> two wire factory setup.  The factory setup has one bulb and the 
> replacements I purchased have two bulbs and a switch.  One bulb is for 
> the regular "dome" action and the other is a switched map light.  I'll 
> have to figure out how to wire this up with my ETM but if anyone has 
> already done this and can give me some pointers it would be appreciated. 
> I believe someone was commenting on the necessity of installing diodes 
> in place. Is that correct?  TIA. 
> 
> Chuck MacWilliam, R.N.

 The diodes are only used if there was one bulb and two switches.
If you have two bulbs they are independent.
You need to measure if the two wires have switched ground or 12 V.
If one of the factory wires have 12 volt all the time you connect
your third wire to ground.
But if the 12 volt only is on when the "dome" is one you need to find
a permanent 12 volt to connect your third wire to.

 Eric Raquette

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