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Old 05-22-2020, 10:02 PM   #1
J48chevy
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Elecrtical?

Well first the good. Started my truck for the first time and success it runs great. The bad, electrical. Here is my dilemma. I have the American Autowire harness I installed. I am running the dolphin/shark manual gauges. When I turn the truck on my gauges are on. I have tried everything I can think of but after 3 hours and same issue I took a break. The back of the gauge with volts/fuel/temp/oil there is a harness with a black, yellow, red, white, blue, green. I know the green is oil, blue is fuel, white is temp, black is ground. The red is + and yellow is + (light switch). This is what manual says. So if this is right I hook the red to 12v fused source and the yellow to???

My speedo gauge just has the 2 wires for the bulbs, red/black. When I hook the grey wire from American Autowire harness that says dash light clearly on the wire to the red wires, and the black to ground, the lights stay on.

As I am not a wiring guru, I have followed all instructions but this one has me perplexed. Any thoughts and ideas would be appreciated.
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Old 05-22-2020, 10:25 PM   #2
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Re: Elecrtical?

I would think the yellow wire would be hooked to the AA gray wire, and the red would be a switch on 12v
and the red from the speedometer would need tied into the yellow
without instruction sheet I'm just guessing
can you check the AA gray wire to see if you can turn the power on/off with the switch?
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Old 05-22-2020, 11:38 PM   #3
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Re: Elecrtical?

Sounds like you have the gauge lights connected to the wrong side of your headlight switch. Your gauge lights (yellow wire) need to be connected to a switched 12v source - IOW the output side of your headlight switch. I think American Autowire uses standard GM color coding, so the gauge lights (yellow) should connect to the brown wire out of the headlight switch (may be labeled something like Dash Lights, Park, Tail, etc). Use a test light to confirm.
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Old 05-22-2020, 11:38 PM   #4
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Re: Elecrtical?

Quote:
Originally Posted by mongocanfly View Post
I would think the yellow wire would be hooked to the AA gray wire, and the red would be a switch on 12v
and the red from the speedometer would need tied into the yellow
without instruction sheet I'm just guessing
can you check the AA gray wire to see if you can turn the power on/off with the switch?
Nope tried that one already. For some reason the grey wires labeled dash light are power when I hook up the battery causing the dash lights to be on. The switch does not turn them off either. I think I have hooked up every possible connection today. Guess tomorrow is another day.
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Old 05-22-2020, 11:39 PM   #5
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Re: Elecrtical?

Quote:
Originally Posted by MiraclePieCo View Post
Sounds like you have the gauge lights connected to the wrong side of your headlight switch. Your gauge lights (yellow wire) need to be connected to a switched 12v source - the output side of your headlight switch. It sounds like you're connecting your gauge light wires to the hot input side of your headlight switch. I think American Autowire uses standard GM color coding, so the gauge lights (yellow) should connect to the brown wire out of the headlight switch. Use a test light to confirm.
Ok will give that a try tomorrow.
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Old 05-23-2020, 12:03 AM   #6
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Re: Elecrtical?

I'm not sure which kit you have from AA , but I was looking at their schematics, and it does show the gray wire for the dash lights...check that to see if it will turn 12v on/off with the switch

well ,I just saw where you said it wont...so scratch that...
like miracle says,,,check your switch wiring...are you using the AA switch?
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Old 05-23-2020, 12:04 AM   #7
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Re: Elecrtical?

Here are some pics of switch and diagrams. The brown wires on switch are for tail and park light feed.
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Old 05-23-2020, 12:12 AM   #8
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Re: Elecrtical?

mongocanfly. Tried the grey wires that are labeled dash light. When I connect the red wire or yellow wire to them the lights come on. Switch will not turn them off. In the pics above the switch and switch plug was set and included in the kit so I just plugged them in.
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Old 05-23-2020, 12:19 AM   #9
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Re: Elecrtical?

Quote:
Originally Posted by mongocanfly View Post
I'm not sure which kit you have from AA , but I was looking at their schematics, and it does show the gray wire for the dash lights...check that to see if it will turn 12v on/off with the switch

well ,I just saw where you said it wont...so scratch that...
like miracle says,,,check your switch wiring...are you using the AA switch?
Yes. Switch and plug for harness included in the wiring kit. Bought the kit specifically for year of truck.
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Old 05-23-2020, 12:19 AM   #10
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Re: Elecrtical?

that shows the dark green wire for the instrument lamp
somewhere its switching from green to gray...
does it leave the switch green and then change to gray at the connector?
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Old 05-23-2020, 01:44 AM   #11
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Re: Elecrtical?

Did you use the Part #: 500467 classic update kit or the Part #: 30905 complete wiring set (original replacement) kit?

Also do you have the original headlight switch or an aftermarket switch?
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Old 05-23-2020, 11:17 AM   #12
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Re: Elecrtical?

Quote:
Originally Posted by mongocanfly View Post
that shows the dark green wire for the instrument lamp
somewhere its switching from green to gray...
does it leave the switch green and then change to gray at the connector?
The green goes from the switch to the fuse box. No green out of fuse box. I am thinking that must be the relay and grey wires coming out of fuse box. I have 2 of them.
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Old 05-23-2020, 11:21 AM   #13
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Re: Elecrtical?

Quote:
Originally Posted by mr48chev View Post
Did you use the Part #: 500467 classic update kit or the Part #: 30905 complete wiring set (original replacement) kit?

Also do you have the original headlight switch or an aftermarket switch?
Kit 500467 and the switch came in the kit.
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Old 05-23-2020, 12:42 PM   #14
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Re: Elecrtical?

Diagram for the switch. I verified every wire is correct. It almost seems like the grey wires coming out of the fuse box labeled dash lights have constant low power. Light are on low. Then pull switch and they are bright. Confusing.
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Old 05-23-2020, 01:18 PM   #15
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Re: Elecrtical?

Hmmm..sounds like you got everything right...may need a call to AA next week..I've been looking thru my installation instructions...and i cant see anything you've done that stands out as wrong...
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Old 05-23-2020, 02:59 PM   #16
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Re: Elecrtical?

there should be a pink wire in your harness marked gauge feed that is a 12volt ignition source that should provide ignition 12v to your gauges so the dash does not come on until you start the truck. the grey wire is gauge lights that comes from your headlight switch.
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Old 05-23-2020, 04:58 PM   #17
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Re: Elecrtical?

This ain't that complicated. Any of those wires emanating from the headlight switch that are cold when the switch is off and hot when the switch is pulled could be spliced into the gauge lights. A test light will tell you which, but according to my GM wiring diagram for Dolphin Gauges either of the brown wires will work.
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Old 05-23-2020, 10:18 PM   #18
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Re: Elecrtical?

The brown wires from switch to fuse box are for front and rear park lights. The green wire from the switch to fuse box them have 3 grey from fuse box for dash lights. I had it working fine earlier with no lights staying on. Got home and wanted to check again and yep they are back on at low voltage. I did notice that the hazard round silver fuse is getting warm. This is the 2 brown wires from the switch to fuse box. Any idea why that would be hot and could that be the issue?
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Old 05-23-2020, 10:39 PM   #19
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Re: Elecrtical?

if you hooked into the park light circuit (brown wire),then you would have no ability to dim the dash lights.but the lights should work when you turned on/off the park lights..theres some issue there that's causing a problem..
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Old 05-23-2020, 11:24 PM   #20
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Re: Elecrtical?

Quote:
Originally Posted by mongocanfly View Post
if you hooked into the park light circuit (brown wire),then you would have no ability to dim the dash lights.but the lights should work when you turned on/off the park lights..theres some issue there that's causing a problem..
Thanks yeah 2 days of messing with this drives me crazy. You would think it was a basic easy install.
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Old 05-23-2020, 11:29 PM   #21
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Re: Elecrtical?

I'm wondering if your light switch has a issue
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Old 05-23-2020, 11:46 PM   #22
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Re: Elecrtical?

Quote:
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I'm wondering if your light switch has a issue
I was thinking the same thing. Might just order one and try.
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Old 05-24-2020, 11:05 AM   #23
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Re: Elecrtical?

that round silver thing you called a fuse is not a fuse its the flasher for the turn signals/4ways. I think maybe you are confusing the power feed for the gauges with the dash light circuit. according to the above pictures you have a factory fit wiring harness, that means your dash/gauge lights should be fed from the green wire coming from your headlight switch. I would use the tan wire marked CB to provide 12v to your gauges for their power, gauge power and gauge light power are 2 separate functions. with gauge light power hooked to green from the headlight switch you should have dimming and should switch off with headlights.
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Old 05-24-2020, 01:45 PM   #24
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Re: Elecrtical?

Well I found what wire is causing issue but no idea how to fix. Here is what I discovered. Bad switch or why is rear brown wire causing this?

When I have everything connected correctly the dash lights stay on low power, tail lights off and brake lights work. Pull light switch out and can dim and adjust lights but taillights are bright and no break lights.

So I checked all wires on switch. Found that if I disconnect the rear brown wire then dash lights do not stay on but tail lights are on and still have brake lights. When I pull switch out dash lights work and can adjust and dim.

It seems this one brown wire is causing the issue? 2 brown wires on switch. One to front and one goes to rear. Now I don’t have headlights connected yet but wouldn’t think that would cause issue? Wires are just run to the front of truck right now.
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Old 05-24-2020, 01:50 PM   #25
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Re: Elecrtical?

Quote:
Originally Posted by jwhotrod View Post
that round silver thing you called a fuse is not a fuse its the flasher for the turn signals/4ways. I think maybe you are confusing the power feed for the gauges with the dash light circuit. according to the above pictures you have a factory fit wiring harness, that means your dash/gauge lights should be fed from the green wire coming from your headlight switch. I would use the tan wire marked CB to provide 12v to your gauges for their power, gauge power and gauge light power are 2 separate functions. with gauge light power hooked to green from the headlight switch you should have dimming and should switch off with headlights.
Thanks yes after tracing wires the brown wires from switch simply go to front and rear lights. The green wire from switch goes to fuse panel where 3 grey dash light wires exit. I have these hooked to dash light for speedometer and also yellow wire for oil/temp/gas/volt gauge (marked light switch +). I have tried using orange 12v power wire and pink 12v ignition wire to supply power to gauges with same results for both.
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