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914World.com _ 914World Garage _ 914 Interior Light

Posted by: tyler Dec 23 2005, 12:28 PM

Can someone tell me about the backpad light? I'v got a supposed late model interior but the light has no switch. According to the wiring diagram there's also a direct ground wire to the switch, meaning the light has three wires off the back. Are all these lenses same shape, so if I find one with a switch, it will fit inside the chrome piece?
I notice the ones on Ebay are more money than the one that AA sells, but that's not uncommon.
BTW, I'm putting in new door switches and the new replacements that AA sells are real cheapos, exposed spring and all. And the switch makes the ground so the ground wire is eliminated (only 2 terminals). I haven't figured out the buzzer circut yet - none of the red wires seem to be a ground contact but that must be how it works.

Posted by: ClayPerrine Dec 23 2005, 02:38 PM

The interior light should have a switch incorporated in it. The side of the light is where the power lead connects. One side of the switch connects direct to ground, and the other side of the switch connects to the door jam switches, wired in parallel, to supply ground to the light when the door is opened.

The door buzzer circuit uses the other connection on the door jamb switch to supply ground to the buzzer. The key has to be in, and the door opened to get the buzzer to sound.

I don't know the details on the door buzzer stuff. I pull all that out. I don't need big brother reminding me the key is in the ignition.

Posted by: tyler Dec 26 2005, 02:27 PM

My mistake - looks like the guy I bought the car from put in a non-Porsche light with no switch. All wire up.
The new replacement switches won't work the buzzer anyway. They only make a ground connection. The red buzzer wires aren't grounded, they make a switch contact and the replacement switch isn't set up for that.

Posted by: SLITS Dec 26 2005, 04:02 PM

QUOTE (tyler @ Dec 26 2005, 01:27 PM)
The new replacement switches won't work the buzzer anyway. They only make a ground connection. The red buzzer wires aren't grounded, they make a switch contact and the replacement switch isn't set up for that.

In a circuit with a switch, one of the leads is broken with the switch. In the case of the buzzer, the ground lead is broken with the switch and when closed completes the circuit (just like the handbrake). The + power to the buzzer is constant and the ground side is broken by the switch in it's NO status when the door is closed. It is actually a NC spring loaded switch.

wheeeeeeee!

Posted by: smg914 Dec 26 2005, 06:39 PM

For all you anal/purists......There are at least 8 or more versions of the interior light that will fit a 914. But only one is correct.

Chrome bezel, flat/square/ribbed/white/on off switch, HELLA/Made in Germany/VW on the face, 3 male push on type connectors, 2 spring connectors that the light bulb fits into.

Attached image(s)

Posted by: msglaigaie Dec 26 2005, 07:09 PM

Ouch. Thats so, so, correct. It almost feels german.
MSG L