Question about 1978 Chevrolet C1500

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Need to attach new electric temp. switch/sensor where aftermarket mechanical one is installed

I need a chasis wiring harness diagram for a 1971 GMC c1500. The motor was rebuilt and an aftermarket temp. gauge attached on front of vehicle. I want to install a new sensor/switch, but do not know which wire from the wiring harness that plugs into the the instrument bezel to use. Thanks Richard

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The factory wire to the factory gauge is a solid green wire. that year truck the sending unit usually mounted in the drivers side cylinder head but i have seen some in the passanger side if they have cut the wire and you can goto the main harness connector under the brake master cylinder and booster and find the only solid dark green wire and follow it forward to see how far it back they cut then just splice and run it to your new sending unit . If you want to check to make sure the gauge works after you find the solid green wire put it to a ground and the gauge should go to hot if it does not you have a bad gauge or a cluster wireing in side the truck and that is why they put the aftermarket gauge in .

Posted on Jun 01, 2009

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If you do not have access to an aftermarket interface cable (some are available depending on brand and model of aftermarket radio), then yes, you have to bypass the amp if the new head unit has an internal amp, AND you wish to use the factory speakers with the new stereo.

There are many ways to do this, but if you want to do it yourself, the absolute best way is to get a copy of the dash harness wiring diagram from GM. This diagram will identify which pins in the radio dash harness connector run to the speakers and/or the amp, and whether you have to run new wires to the output side of the amp to connect to the speakers--this will not be specifically identified in the GM diagram (it will not say anything like 'to connect aftermarket radio, etc.), but it will be evident that you have to do this if there are no speaker pins in the in-dash connector.

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Installing temperature gauge 1999 Mustang 3.8L


Congrats. Sarcasm is free.
I didn't see a question, so let's play the guessing game.

Air temp?
Water temp?
Oil temp?
Trans temp?
Your temp?

Do you need to know how to mount a gauge to the dash?
Do you need to know where to run the power wire for gauge light?
Do you need to know where to install the sensor on intake and or engine?
Do you need to borrow some tools?

I feel better after unloading sarcasm.

Now, I'm going to assume it's water temp.

if it's electronic, you can just remove the stock sensor wire from on/near the waterneck/thermostat housing and plug in the new wire.

If it's mechanical, you will need to install the new probe into a port where it can contact the water.

On my old 3.8 (1997) I changed to an aftermarket waterneck that had a spot to screw in a temp probe.

On my 2003 gt, I haven't upgraded gauges yet, but the water sensor is on the front passenger side of the intake. I will add a pic of my gt so you can see the placement.

With this type, you can just add your wires to it (splice them in) and keep both the stock gauge & the aftermarket.
Or just remove the stock wire, then the stock sensor, then install the new stuff.
it's the black wire near the alternator. (almost center right of the pic to the right of the pink fuel injector)

1_20_2013_6_43_49_pm.jpg

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The Crankshaft Position (CKP) sensor is mounted to the transmission bellhousing at the left/rear side of the engine block. The sensor is adjustable and is attached with one bolt. A wire shield/router is attached to the sensor.

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New replacement sensors will be equipped with a paper spacer glued to bottom of sensor. If installing (returning) a used sensor to vehicle, a new paper spacer must be installed to bottom of sensor. This spacer will be ground off the first time engine is started. If spacer is not used, sensor will be broken the first time engine is started.
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I need the wiring diagram for installing a trailer plug for my 1998 chevy silverado


sammy tatz,

There usually is not a diagram for this type of wiring, as it's wired directly into the current wires. You simply need to follow the wires on the truck (if doing the plug here) and run the wiring to these as needed per light.

If you are wiring the trailor - the new wiring harness should be color coded as well as labeled (if new) for each light. Trace the wires (if attached still) and attach each wire as necessary to it's appropriate light.

I have never personally heard of wiring diagrams for this, at least not for aftermarket wiring. Any other diagrams for wiring can be found in a service manual for your truck.

Please let me know if you need further assistance with this matter.

carsandcomps,

Guru, Premium Expert @Fixya.com

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