70-72 dash swap wiring - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 15 (permalink) Old Nov 17th, 16, 12:18 PM Thread Starter
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Randy
 
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70-72 dash swap wiring

I have a 70 Malibu with sweep dash. I bought a 72 gauge dash, which includes the wiring harness all the way back to the fuse box. It would be easier to leave the 70 wiring harness in the car, but I know some of the wiring is not the same (gas gauge, for one). I do have an assembly manual. Has anyone done this swap, and what was your experience? I'm just asking for advice here, not here to argue about what type of dash or gauges to use.
thanks,
Rat

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post #2 of 15 (permalink) Old Nov 17th, 16, 12:57 PM
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Re: 70-72 dash swap wiring

Quote:
Originally Posted by rattracer View Post
I have a 70 Malibu with sweep dash. I bought a 72 gauge dash, which includes the wiring harness all the way back to the fuse box. It would be easier to leave the 70 wiring harness in the car, but I know some of the wiring is not the same (gas gauge, for one). I do have an assembly manual. Has anyone done this swap, and what was your experience? I'm just asking for advice here, not here to argue about what type of dash or gauges to use.
thanks,
Rat
Seems like you've been here awhile...lol. Love your post. Good luck, hope you find your answer. If it were me, i'd probably take both harnesses out, lay them out, cut the wrap in spots and splice in the correct wires for you dash. Rewrap and install.
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post #3 of 15 (permalink) Old Nov 17th, 16, 1:13 PM
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Re: 70-72 dash swap wiring

Ask and you shall receive.. This link will give you everything you need to make the swap.

1972 Chevelle SS Wiring Diagram and Pictures
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post #4 of 15 (permalink) Old Nov 17th, 16, 1:28 PM
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Re: 70-72 dash swap wiring

Do a search. There are many Threads on doing this conversion and the required mods for the harnesses.

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post #5 of 15 (permalink) Old Nov 17th, 16, 3:39 PM
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Re: 70-72 dash swap wiring

Randy- is your dash aftermarket or OE? Does it have the seat belt warning light? Photos would help, what color are the characters on the gauges?
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post #6 of 15 (permalink) Old Nov 18th, 16, 8:55 AM
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Re: 70-72 dash swap wiring

I've done it and it kind of sucked. I had to re-pin all about about 2 wires in the fuse box, but I was lucky and had a 70 ROUND gauge harness to go off of. I sat in the basement for about 3 hours and separated both looms completely. Ran each trace individually and tested everything several time before reconnecting to the car. Several people will tell you it can't be done because of all the changes to the dash harness in 72. I can be done, I've had a 72 dash in my car for 5 years now with not one issue.

Because I had no real use for the fasten seat belts light I turned it into a line lock light

If you want to PM me your email address, I still have most of the documentation used and I'll send it to you.









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post #7 of 15 (permalink) Old Nov 18th, 16, 12:07 PM
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Re: 70-72 dash swap wiring

I would sell your original 72 gauge harness and buy a correct used or new 70 gauge harness. Why mess up the 72 harness? There is a member on Team Chevelle who sells reconditioned and converted sweep dash harnesses. He could convert your sweep harness to a gauge harness. He could also sell you one ready to go. If you decide to convert your sweep harness on your own own, you will need to get a 12 pin connector to plug into the gauge cluster. I sell those if you will need one.

Here is a link to Dave the harness tweeker.

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post #8 of 15 (permalink) Old Nov 22nd, 16, 3:36 PM Thread Starter
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Randy
 
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Re: 70-72 dash swap wiring

Thanks for all the replies. I cleaned up the 72 dash, and repainted the black following a video I found online from Stacey David, the "gears" guy. I've got the three main gauges installed, still have the idiot lights for the three smaller gauges. I laid out the harnesses like you guys suggested. It doesn't look like there are that many difference, except for the instrument panel, like RealRed 70 says. Think I will give "Dave the harness tweaker" a shout before I go any further. Thanks again for all the advice.
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1970 Chevelle Malibu. Red. Did it come in another color?
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post #9 of 15 (permalink) Old Nov 22nd, 16, 3:51 PM Thread Starter
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Randy
 
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Re: 70-72 dash swap wiring

Quote:
Originally Posted by 70SSTHUMPER View Post
Randy- is your dash aftermarket or OE? Does it have the seat belt warning light? Photos would help, what color are the characters on the gauges?
Thanks Thumper. it is OE, got it from a guy for a couple hundred bucks, it is OE. Does have the seat belt warning light, and the gauges are white background with black characters. I know the 70s were green, but I'm going with white on this car. thanks again.

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post #10 of 15 (permalink) Old Nov 22nd, 16, 3:54 PM Thread Starter
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Re: 70-72 dash swap wiring

Quote:
Originally Posted by Bart_Swisher View Post
Ask and you shall receive.. This link will give you everything you need to make the swap.

1972 Chevelle SS Wiring Diagram and Pictures
Thanks, Bart. Someone did a lot of work documenting that project, very helpful. The diagrams in the assembly manual are good, but they don't reference the color coding. I've printed out the stuff off your link, thanks!

1970 Chevelle Malibu. Red. Did it come in another color?
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post #11 of 15 (permalink) Old Jun 29th, 20, 12:33 AM
Rian
 
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Re: 70-72 dash swap wiring

Hi Bart,

You did an excellent job of documenting your wiring harness schematics. I have a 1970 Malibu that the previous owner converted to an SS gauge type dash. I'm not sure whether or not he switched the wiring harness; but I would think that he had to do so in order for it to work properly.

I am changing my radio and noticed a black plastic wire connector, with only one terminal, hanging down under the dash to the right (passenger side) of the instrument cluster. It appears to be a part of the large group of wires that go to the fuse block; but it is very hard to see. This black plastic connector has only one terminal; yet has two wires, black with a pink or purple stripe and a brown, going in to it. It appears that the brown wire goes toward the passenger side of the dash, but I can't tell where it goes.

I have carefully reviewed your photos and schematics; in addition to several other wiring diagrams that I already had, and have not seen any reference to this connector. I can't even find a reference to a black wire with a purple or pink stripe on it. I tried to drag and drop a photo, but it didn't work.

Do you have any ideas?

Thank you very much. Rian
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post #12 of 15 (permalink) Old Jun 29th, 20, 12:34 AM
Rian
 
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Re: 70-72 dash swap wiring

Here is a photo of the wire connector.
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post #13 of 15 (permalink) Old Jun 29th, 20, 6:38 PM
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Re: 70-72 dash swap wiring

That connector is only used on cars with A/C. Does your car have A/C?


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post #14 of 15 (permalink) Old Jun 29th, 20, 11:52 PM
Rian
 
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Re: 70-72 dash swap wiring

It does not have A/C. Thank you so much for clarifying this issue. I am changing my radio and wanted to make sure that I didn't accidentally unplug this connector from the instrument panel. I appreciate it!
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post #15 of 15 (permalink) Old Jun 30th, 20, 9:27 AM
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Re: 70-72 dash swap wiring

You are very welcome.


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