Wiring help for AEM afr

[mvliotta]

Hi all,

Need some basic help with wiring up my newly purchased AEM analog afr.

I searched and could not find an answer to the most basic of questions:

Which interior wires should I tap to connect the analog afr gauge?

They call for connections to

1) 12 V power

2) ground

3) switched 12 V power

4) instrument lights (optional)

Many thanks!!

Vince

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[ray_]

How 'bout this?

 

http://aemelectronics.com/files/instructions/30-5130 Analog Wideband UEGO Gauge Gasoline AFR.pdf

 

Oh. Hmm well u need to look for a switched power source. I believe one of the key positions has a lead which is hot during run and start. You might put a meter on those terminals. I believe I went with that for switched.

 

Also use good grounds. You can run one to the column securing bolts.

 

hth,

Edited September 17, 2016 by ray_

[KenH]

They don't come any more helpful than Ray

[ray_]

1 minute ago, KenH said:

They don't come any more helpful than Ray

 

 

Looky here you!

 

Is your car moving yet?

[mvliotta]

Thanks Ray...although you may be overestimating my wiring knowledge.

 

-Ground is easy enough.

-I guess I'll find a hot lead behind the instrument panel (maybe the one going to lighter?)

-Same approach above for instrument light?

-I guess you are suggesting I dismantle around ignition switch to find 12V switched lead?

 

Sorry for the basic questions...Thanks for the help

Vince

 

 

[ray_]

A search will likely turn up ignition switch position terminals and description. Also the panel lights wiring.

 

I don't have under dash panels in, so it's pretty easy for me to check the switch positions  ;-) They're been in a box for 10 years now, heh.

 

The lighter wiring is hot full time. I'm not opposed to tapping off that for a low amp draw. Others may differ.

 

Someone with more specific first-hand knowledge (and less laziness!) should chime in

 

Cheers,

[KenH]

3 hours ago, ray_ said:

 

 

Looky here you!

 

Is your car moving yet?

Of course it's moving !!  Jake and Tim push it around the shop all the time

Edited September 17, 2016 by KenH

[xferboy]

check your switched 12v closely.  I picked the wrong one, and my afr 'boots' twice.  The wire I have goes off in the start position.

 

bugs me, but not enough to fix until winter....

[ray_]

Yeah the circuit which powers the +12 on the coil is a good choice...

 

btdt

 

 

Cheers,

[jgerock]

I tied the 2 12v power leads together. This (I believe) causes the needle to remain in the last position when powered off.  Check your directions to be sure. IIRC I tapped off the #15 circuit to a terminal block inside the car so I could run the AFR gauge and electric fuel pump.

[peterschop]

I plugged my hot wire into the rear window defroster switch since it is not in use. I have a digital afr display mount in the dash fasten seat belt pod. That way I can turn the display off if I don't want to explain what it is to a clueless passenger.

Edited September 17, 2016 by peterschop

[mvliotta]

Thanks of the sharing!

[2002Scoob]

I spliced into the purple wire (ignition) for all my interior 12v stuff for mine, and did the ground to the steering column as previously mentioned


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[mvliotta]

So just to close the loop...

 

As some did, twisted red and pink wires together from AEM gauge and spliced to purple wire (12V switched) from ignition module. Found a ground under the dash.

 

Here is where I put the guage... used jgerock's post from long ago as inspiration. No holes in dash, used a custom shroud to hold it in place and angled up slightly for easy viewing.

 

 

Reading about 11-12 at idle and 14-15 with throttle. Looks like a have some tii tuning to do to tighten up the range and richen up when under some load.

 

Thanks again,

Vince