UrS4 Under dash power posts, question

Draky · Post by **Draky** » Tue Jul 29, 2014 4:14 pm

Finishing the install on my radio system right now and I just realized I don't really know which posts to use... I pulled the covers at the driver's knees (pic below) and was told to use post 15 for ignition source. Is there a post I can use for illumination? The posts are numbered the following:

30, 30a, 58a, 75x, 15a, 75a,15

And almost forgot to mention, this is on a 92 UrS4

Thanks again for the help guys! You guys always ROCK!!

morris400 · Post by **morris400** » Tue Jul 29, 2014 5:26 pm

I used 75x for my boost gauge install. Not sure if it helps but thats what i used. It works for the gauge light.

Draky · Post by **Draky** » Tue Jul 29, 2014 5:46 pm

So 75x gives your gauge light when you turn on the lights on the car?

my2000apb · Post by **my2000apb** » Tue Jul 29, 2014 7:15 pm

if you have a Bentley its easy to chase down the dimmer switch wire

Draky · Post by **Draky** » Tue Jul 29, 2014 8:39 pm

I do not have one.

Draky · Post by **Draky** » Tue Jul 29, 2014 9:34 pm

Anyone with a Bentley care to help me out? Just trying to verify post for illumination, think it may be the 75x.

scubadave · Post by **scubadave** » Wed Jul 30, 2014 12:52 am

you know, you could always try probing that post and others with a test light or DVOM to see what it does when cycling the key, turning on the lights, playing with the dimmer ect.

Post by **EDIGREG** » Wed Jul 30, 2014 7:34 am

75x is switched 12v

dana · Post by **dana** » Wed Jul 30, 2014 8:37 am

just start probing around with a multimeter and find something that switches on with the lights and drops voltage with the dimmer. Easy.

Draky · Post by **Draky** » Wed Jul 30, 2014 8:53 am

dana wrote:just start probing around with a multimeter and find something that switches on with the lights and drops voltage with the dimmer. Easy.

Problem is I recently moved and can't find my multimeter.

dana · Post by **dana** » Wed Jul 30, 2014 10:35 am

Draky wrote:
dana wrote:just start probing around with a multimeter and find something that switches on with the lights and drops voltage with the dimmer. Easy.
Problem is I recently moved and can't find my multimeter.

bummer! I can't live without mine.

morris400 · Post by **morris400** » Wed Jul 30, 2014 6:04 pm

Draky wrote:So 75x gives your gauge light when you turn on the lights on the car?

Yepers

UrSobsessed · Post by **UrSobsessed** » Wed Jul 30, 2014 8:58 pm

There should be a source in one of the wire harnesses for the stock HU. If you want it to operate with the head lights, and dim with the rheostat on the instrument cluster, then tap into the wires for the ashtray light. I tapped those for my boost gauge so it goes along with the dash lights.

Post by **EDIGREG** » Thu Jul 31, 2014 7:25 am

morris400 wrote:
Draky wrote:So 75x gives your gauge light when you turn on the lights on the car?
Yepers

No, 75x is switched 12v. If the ignition is on, it is hot.

Like Dace said, if you want it to turn on with the headlights and dim, ashtray is the easiest source

UrS4 Under dash power posts, question

UrS4 Under dash power posts, question

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