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Old 11-15-2016, 08:43 PM   #1
ak_petey
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Default 1991 chevy cclb dash wiring

Lets see if i get any different advice. I posted up a dilemna on facebook today with two responses. One cheap (me likey), the other is a little expensive $500.

I am eliminating the stock gauge cluster in my square body 91 crew cab. I am doing this because i am going with stand alone gauges. The prior owner took the computer out an i was left with no speedometer. Has anyone done something like this?

The problem is that in eliminating the dash's cluster gauge i also need to rewire /connect the cluster plug to make turn signals,tail lights and headlights work. If i dont make a connection there somehow, none of the interior and exterior electronics work on the truck. The backside of the cluster has a circuit board that directs the electronic traffic and makes the connections to lights, signals etc.
This vehicle's speed sensor is electronic. The wiring harness looks to be after market, i pulled it from a cucv parts truck. The motor is a carbed 350. The transmission is controlled with a stand alone controller.

The suggestion was to purchase a drop in aftermarket gauge and be done. ($500 option, and easy!)

The other option was to start splicing wires. Cheap, but i dont know how to go about it without potentially giving myself waaaaay more work than i would like. I also would need to rig up turn signal indicator lights in the cab. So, with that said, i am also likely going to sell the truck. So i would like to minimize the cost but complete the job and not hack it.

Ive already got a gauge cluster set up and ready to go, its just completing the wiring or invest in the after market gauge
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Old 11-15-2016, 10:41 PM   #2
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Default Re: 1991 chevy cclb dash wiring

doing your own wiring is tedious. Could be very frustrating tying into an aftermarket harness if you don't have any diagrams.

Post up lots of details if you do it cause I will need to do my 96 suburban/cummins project eventually.
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Old 11-16-2016, 06:06 AM   #3
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Default Re: 1991 chevy cclb dash wiring

You're in for some wire splicing. which gauge cluster? square bodies had a few different options. which transmission, with what controller? depending on the controller, the speedo might be the easiest to get to work with the existing cluster. Its all the other BS on the cluster that is probably going to be a pain.
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Old 11-16-2016, 07:35 AM   #4
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Default Re: 1991 chevy cclb dash wiring

Petey, I have a 1989? factory wiring diagram manual, it SHOULD be close enough to help, although I can't guarantee it. If you are interested post up or call 354 4476, I'll throw it in the mail. This is a big manual about twice the size of a regular magazine. HTH
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Old 11-16-2016, 08:17 PM   #5
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Default Re: 1991 chevy cclb dash wiring

The cluster doesn't control all that stuff you mentioned. It's just indicators that run to it. Dash lights, turn signal indicators, high beam indicator, ect. You can unplug the cluster and everything will still work. You can make individual gauges work fairly easy.
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Old 11-16-2016, 08:25 PM   #6
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Default Re: 1991 chevy cclb dash wiring

http://67-72chevytrucks.com/vboard/s...d.php?t=545416

http://www.mediafire.com/?374hgtxxcgk87ya
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Old 11-17-2016, 06:18 PM   #7
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Default Re: 1991 chevy cclb dash wiring

I second what Joe said, we drove the wifes' Escalade without the instrument cluster for a couple of weeks while the cluster was being repaired.
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Old 11-22-2016, 01:16 AM   #8
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Default Re: 1991 chevy cclb dash wiring

It was an alyeska truck.. But none of the wiring is the same.
The wiring in it now is the harness from the old sk8abrock 1986 cucv i bought from gus 3 -4 years ago. It was converted to 12v at one point. I think jeremy spencer had it at some point too. The harness in it is definitely not stock.

None of the lights worked when it was all hooked up. I endend up putting a test light to the part where the harness plugs into the back of the cluster and found a brown wire and a pink wire that had power. I bridged the headlight wire to the brown power wire and it gave power to the headlights.

I forgot if the headlight was switched on or not... Ill look at it tomorrow
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Old 11-22-2016, 01:19 AM   #9
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Default Re: 1991 chevy cclb dash wiring

Quote:
Originally Posted by wasillashack View Post
Petey, I have a 1989? factory wiring diagram manual, it SHOULD be close enough to help, although I can't guarantee it. If you are interested post up or call 354 4476, I'll throw it in the mail. This is a big manual about twice the size of a regular magazine. HTH
Thanks for the offer but im dealing with non stock wiring :/
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Old 11-22-2016, 02:56 AM   #10
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Default Re: 1991 chevy cclb dash wiring

Sorry I couldn't help, Good luck!
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Old 11-22-2016, 06:22 AM   #11
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Default Re: 1991 chevy cclb dash wiring

Wtf are you guys doing up so early?
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Old 11-22-2016, 09:09 AM   #12
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Default Re: 1991 chevy cclb dash wiring

Quote:
Originally Posted by joe231 View Post
Wtf are you guys doing up so early?
Sleep is for the weak
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Old 11-22-2016, 01:27 PM   #13
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Default Re: 1991 chevy cclb dash wiring

I'm weak then
Lol
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Old 11-27-2016, 10:08 PM   #14
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Default Re: 1991 chevy cclb dash wiring

Quote:
Originally Posted by joe231 View Post
I'm weak then
Lol
Its all good grey beard!

Sooo... I found that the truck does in fact not require the dash for all the lights. The backside of the fuse box isnt wired to supply power to the lighting row. Which is pretty annoying. Maybe when it warms up i will see about pulling the rest of a the harness out of the larts truck at a buddy's home.

Ive been plugging away at each system very slowly. Got the blower motor to work, made sure the back up lights work and all driving lights and marker lights are in operating condition. I even vacuumed the headliner, which proved to be a mistake as it is super fragile. My shop vacuum was sucking strips of the headliner out! Oh well. Its an old truck.

Today was figuring out why the brake lights were not coming on. .. Took waaay to long and its still not right. Turns out there is a toggle switch that turns it off. It took chasing the brake switch light wires and cleaning the rear plug harness. One thing that puzzles me still is how to make the brake light blink while pressing the break pedal with the turning signal is going.
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Old 11-27-2016, 10:21 PM   #15
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Default Re: 1991 chevy cclb dash wiring

Quote:
Originally Posted by snowbear View Post
doing your own wiring is tedious. Could be very frustrating tying into an aftermarket harness if you don't have any diagrams.

Post up lots of details if you do it cause I will need to do my 96 suburban/cummins project eventually.
Is your burban going to be streetable?

I just need to figure how im going to run my signal lights to the interior interior turn signal light indicators. I put a test light on the gauge cluster prongs to find which one i need to tap into and run to the light light bulb turn arrows.

I am pretty much running a single power wire the splices out to each gauge light.
After looking at my bank account ill have to either wait and order or use what i have made already.
A while ago i ordered a few Gauges from summit and a fuel tank gauge sender. The purpose of that was because The Diesel fuel level sensor gives off incorrect ohm readings. to the gas gauge i ordered.
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Last edited by ak_petey; 11-27-2016 at 10:22 PM.
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Old 11-27-2016, 10:41 PM   #16
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Default Re: 1991 chevy cclb dash wiring

Quote:
Originally Posted by ak_petey View Post
Its all good grey beard!

Sooo... I found that the truck does in fact not require the dash for all the lights. The backside of the fuse box isnt wired to supply power to the lighting row. Which is pretty annoying. Maybe when it warms up i will see about pulling the rest of a the harness out of the larts truck at a buddy's home.

Ive been plugging away at each system very slowly. Got the blower motor to work, made sure the back up lights work and all driving lights and marker lights are in operating condition. I even vacuumed the headliner, which proved to be a mistake as it is super fragile. My shop vacuum was sucking strips of the headliner out! Oh well. Its an old truck.

Today was figuring out why the brake lights were not coming on. .. Took waaay to long and its still not right. Turns out there is a toggle switch that turns it off. It took chasing the brake switch light wires and cleaning the rear plug harness. One thing that puzzles me still is how to make the brake light blink while pressing the break pedal with the turning signal is going.
The brake lights run through the turn signal switch in the steering column, so when you actuate a turn signal it opens the appropriate brake signal circuit and applies the flashing signal...
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Old 11-28-2016, 07:51 AM   #17
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Default Re: 1991 chevy cclb dash wiring

Sweet. Thanks
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Old 11-28-2016, 09:02 AM   #18
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Default Re: 1991 chevy cclb dash wiring

Quote:
Originally Posted by joe231 View Post
The brake lights run through the turn signal switch in the steering column, so when you actuate a turn signal it opens the appropriate brake signal circuit and applies the flashing signal...
So.... If the brake light wire runs from the switch directly to the tail light s harness, i need to dig in to the harness and divert it through the turn signal's rear right and left input ?
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Last edited by ak_petey; 11-28-2016 at 09:04 AM.
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Old 11-28-2016, 05:54 PM   #19
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Default Re: 1991 chevy cclb dash wiring

I'm not sure exactly how it goes.
I'll have to look at schematics
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Old 11-29-2016, 12:20 AM   #20
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Default Re: 1991 chevy cclb dash wiring

You were right
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Old 11-29-2016, 12:21 AM   #21
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Default Re: 1991 chevy cclb dash wiring

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Old 11-29-2016, 06:53 AM   #22
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Default Re: 1991 chevy cclb dash wiring

Right on!
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