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Discussion Starter · #1 ·
My little brother is about ready to go through the roof trying to find this thing...it's referenced in the boost gauge installs but it's not really shown in any of them. Anybody have any ideas?

Thanks!
 

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Re: nightime dimming circuit...where is it? (fasts60r)

IIRC, most folks run a wire (with the vac. hose) to the side marker and tap that. There is no 'easy' wire to tap in the cabin for the 'dimming' or 'lighting' feature (depending on your gauge) inside the cabin.
 

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Re: (juve021)

My boost gauge needed +12V as signal to dim itself.

Have used a bit complicated method.
The CenterConsole (MY05) has a light where the cupholders are. This is on, only when all other switches are also lit, switched by the light sensor on the dashboard.
I used its + for some LEDs. Thought it was simple 12V, but it is not because of the Volvo dim-function. Not even if you always have the dim switch fully turned up, i think its a PWM.

To get a nice +12V signal when the instrument light is on, i used a little
relay that was lying around with a capacitor around the coil to buffer the PWM (don't know how big it was sry)
Had the 5V Version of the relay, think the 6V might work best.
Don't use the 12V because there aren't 12V !!!
The relay switches + from Kl.15 (ignition from cig lighter) to generate a +12V light signal

Works flawless!

Hope you understand what i mean and my english is not too bad!

Edit: You can reach the light by pulling off the handbrake bag!

Modified by Scyn at 11:01 PM 4-11-2009
 

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Re: (juve021)

...to expand on that, I do believe it is a PWM circuit (hence the required capacitor), and there is always a *slight* voltage running through it, even when the car is off.

The use of a capacitor by itself should be plenty..? Maybe not (hence the relay) as it's might not be a full +12V, but that depends on where you tap it. If it's tapped BEFORE the small resistor, I think you should be okay.
 

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Re: nightime dimming circuit...where is it? (fasts60r)

Quote, originally posted by fasts60r »
it's referenced in the boost gauge installs but it's not really shown in any of them. Anybody have any ideas?
To answer the original question, ifyou look directly below the three air direction buttons at the center of the dash (the ones with head/torso/legs), there is a little rectangular lens-type window. That's the twilight sensor in the R and other P2's.

Here's a jpg from the owner's manual - see it at the very bottom?



Tom.
 
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