auto meter cobalt voltmeter installation [Archive] - Forum


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12-25-2007, 01:15 PM
i got a auto meter cobalt volt meter here and am wondering how to wire it up.... it should be obvious how to do it but im not 100% sure how to do it.
heres a link of the back of the gauge:

Im guess the top is for the backlighting and should be wired to the Interior lights like in the how-to section on here....

I- is for a fuse that turns on with the car
S-is for sender..... do i even need to hook that up?
and cant i just wire both grounds together on the back of the fuse and just make 1 run up to the battery terminal?

12-25-2007, 01:19 PM
install guide:

last one on the page

12-25-2007, 07:56 PM
If ya scroll down a bit on the installation pdf it has directions for a voltmeter. There shouldn't be any terminal for a sender on the back of the gauge because it doesn't use one. There should just be a ground and power (ignition), and the ground and power for the lights. Both grounds can be connected together and attached to a single wire going to a grounding point. Connect the "I" terminal to a 12v power source that's only hot with the ignition on. I think the cobalt series uses LEDs? So I don't think they can dimmed. You should hook them to the front side of the dimmer switch maybe, or something else that turns on at night with the lights, but don't hook them directly to one of the interior lights since they are post dimmer switch.

12-25-2007, 08:13 PM
u sure LED's cant be dimmed? i have LEDs in my interior dome/mirror lights now and they dim.... lol

side note-is there a fuse that goes on for ACC and not just ON? id want the gauge for if i run my stereo with the car off.....and i used ACC not ON.

12-25-2007, 08:21 PM
don't know. I thought led's were supposed to have a constant power supply. anyway... you'd want to put a fuse on the power supply side going to the gauge. As for a power source thats on accessory instead of ignition, I'm sure you can find one if you check around with a test light. I could probably find something for ya, but I'm not at home right now so I don't have access to my manual with the electrical diagrams.

12-25-2007, 08:33 PM
i know there are a couple ACC fuses on the passenger side but id rather not run wire all the way over there....... lol . is there anything in the under hood fuse box to consider?

whatever im making this too complicated.

12-25-2007, 08:54 PM
The PDF says it. Just needs ground and ignition. Don't need anything to the S - sender prong.

You could just make 1 ground and 1 power wire. But ur backlight will be on 24/7 whenever the car is on. Or make 1 ground for both, 1 power wire, 1 light wire.

12-25-2007, 09:07 PM
i might as well have the back light go on at night tho... ya know

12-25-2007, 09:12 PM

12-25-2007, 11:31 PM
All i did was connect the 12v to an ignition and for the light to the dimmer so i can controll the brightness

12-25-2007, 11:38 PM
and of course the grounds...... is it worth it for me to run a ground up to the battery? or can i just do some kinda chassis ground around the fuse box?

12-25-2007, 11:50 PM
just ground it in the fuxe box on the drivers side

12-25-2007, 11:52 PM
ah k good. that'll save me some wire too

12-26-2007, 07:25 AM
Yeah, just ground it to the metal dash frame somewhere. There is actually a factory grounding point on it by the fuse panel in the drivers side dash. Just put a ring terminal on the end of the ground wire, take out the 10mm bolt, slip the ring on it and tighten back down. :thumbs:

12-26-2007, 12:17 PM
aight well i got em in. they look good. A-F ratio is indeed a stupid gauge but it looks nice either way. I used the wiper fuse, it turns on at ACC so im good there. pictures will follow later today so you can see em better at night.
thanks for the help/advice.