Gauge wiring help!!

Reply Subscribe

Thread Tools

Search this Thread

Jul 2, 2011 | 06:56 PM

reactor2

Thread Starter

Drifting

Joined: Oct 2006

Posts: 1,724

Likes: 23

From: Minnesota

Gauge wiring help!!

I have a 98 A4 and I'm currently wiring two guages:

1)Electric boost gauge (autometer cobalt)
2)Electric fuel pressure gauge (autometer cobalt)

For the boost gauge the instructions say I need a 12v switched power source that maintains voltage when you are starting the car.

Questions:
1) Where can I find this on a 98 A4?
2) Can I use the same power source for my fuel pressure gauge?

Also I downloaded the A&A instructions for installing a fuel and boost gauge and the instructions say to "locate the black 4 pin connector under the steering wheel (with at least one yellow wire)". They say to use this for switched power (I don't know if this maintains voltage when starting the car but I could test).

The problem is I don't have a black 4 pin connector under my steering wheel (actually there are 2 but they have no yellow wires and use tiny 22 gauge wire so it can't possibly be these). I do have a black 6 pin connector (with 5 wires currently in use and one is yellow), do you think this is the connector the instructions are talking about?

Thanks for the help!!!

Jul 2, 2011 | 11:52 PM

Bill Curlee

Tech Contributor

Joined: Dec 1999

Posts: 32,910

Likes: 2,402

From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

Quote:

Originally Posted by reactor2

In your passengers footwell, theres a dedicated connection just for aux power. Theres a switched and hot and ground wire just for that purpose:

Its a YELLOW (switched), ORANGE (HOT) and BLACk (ground) wire pig tail. If it never been used, it going to be wraped in black duct tape!

Heres a picture of it. Its ABOVE and to the (LEFT) of the BCM:

You can actually disconnect the pig tail from the connection and work on it at the bench:

I use that connection for multiple power sources and long as the group doesnt go over the 20 Amp max current rating

Hope this helps

BC

Last edited by Bill Curlee; Jul 3, 2011 at 12:05 AM.

Jul 3, 2011 | 12:00 AM

PEERPSI

Pro

Joined: Aug 2010

Posts: 545

Likes: 4

From: Calgary Alberta

Umm, well you meant to say above and to the left of the BCM or shiny aluminium box in the picture correct?

Had me looking for a while!

Last edited by PEERPSI; Jul 3, 2011 at 08:58 AM.

Jul 3, 2011 | 12:07 AM

Bill Curlee

Tech Contributor

Joined: Dec 1999

Posts: 32,910

Likes: 2,402

From: Anthony TX

CI 6,7,8,9,11 Vet

St. Jude Donor '08

Quote:

Originally Posted by PEERPSI

Umm, well you meant to safe above and to the left of the BCM or shiny aluminium box in the picture correct?

Had me looking for a while!

Thanks for the QUICK back up. Yea,, I fixed the error.

Been a rough day!

You can fix your post too,,,,,,,,,,,,,,,,,,,,, SAFE and SAY are spelled different!

Thanks Bud!

Bill

Last edited by Bill Curlee; Jul 3, 2011 at 01:19 AM.

Jul 6, 2011 | 01:07 AM