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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


75 - 77 chevelle 2 or 4 door and monte carlo electric??

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ant7377
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75 - 77 chevelle 2 or 4 door and monte carlo electric?? Empty 75 - 77 chevelle 2 or 4 door and monte carlo electric??

Post by S3SS Thu Mar 15, 2018 8:36 pm

Looking for

Vehicle with electric grid rear window. I need a harness behind alternator that is seperate and put inline with regular harness to alternator to power rear electric glass. Please PM me if you could help. Thanks
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Post by Mcarlo77 Sat Mar 17, 2018 10:28 am

It's weird...but, in the dozens upon dozens of Chevelles/Malibus/Montes I've come upon in the JY's here in MN, I have never seen one with the electric grid. Just the fan defrost...and, those haven't exactly been easy to find, either. You'd think up here everyone would have had a rear defrost.

The electric grids seem to have been more common in Cutlasses. I would think they would be wired similarly?
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Post by Hawk03 Sat Mar 17, 2018 1:42 pm

You could see if these guys can make you one. Not sure if what you are looking for is in their catalog.

http://www.wiringharness.com/
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Post by S3SS Sat Mar 17, 2018 2:26 pm

Yes, I'm starting to see its not as common as I thought having rear window grid. Here In Ontario they were plentiful. Hence were.... Thanks Hawk for the link I will enquire with them to see if they can make the harness which compliments engine harness without rear electric grid window. This harness is placed inline if you had that option on car...
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Post by 77camino Sat Mar 17, 2018 2:43 pm

Would the harness be the same in the full size line? I know my 78 Lesabre had a rear window defroster.
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Post by S3SS Sat Mar 17, 2018 2:46 pm

You know 77 I doubt it because Buicks, Cadillac, Pontiac, Olds, etc... were there own divisions. I know for sure Chevrolet, Monte Carlo and chevelle/malibu had the same harness in this case everything was the same except for shape of back glass.
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Post by ant7377 Sat Mar 17, 2018 4:13 pm

My 77 has the electric grid but the wiring from the alternator to the car looks the same as any other car. Stupid thing never worked any way. Even put an nos switch in it.
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Post by S3SS Sat Mar 17, 2018 8:15 pm

I'll take a picture of my one vs the other tomorrow
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Post by S3SS Tue Mar 20, 2018 8:15 pm

75 - 77 chevelle 2 or 4 door and monte carlo electric?? C78bcb88664c58e771e33ebcd0a86a7e
Hawk03 wrote:You could see if these guys can make you one. Not sure if what you are looking for is in their catalog.

http://www.wiringharness.com/



I connected with them the other day and spoke with Darrin today at M & H Electric Fabricators Inc, he was very helpful and confirmed they have the original wiring blue prints from Gm to correctly make the current harness I have. Ordered one today... Thanks Hawk.... See electrical from my GM manual on 76 chevelle
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Post by Hawk03 Wed Mar 21, 2018 12:23 pm

S3SS wrote:

I connected with them the other day and spoke with Darrin today at M & H Electric Fabricators Inc, he was very helpful and confirmed they have the original wiring blue prints from Gm to correctly make the current harness I have. Ordered one today... Thanks Hawk.... See electrical from my GM manual on 76 chevelle

Cool, glad they have the blue prints and are able to supply the harness. I ordered the engine and A/C harnesses from them and the quality of each was good.
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Post by Mcarlo77 Wed Mar 21, 2018 6:20 pm

I still don't get this extra wiring for the rear defrost. I spotted a Monte Carlo at the DVAP yard today with the electric grid and it had the same three wires running to the alternator as any of the other cars out there.
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Post by S3SS Wed Mar 21, 2018 8:08 pm

Mcarlo77 wrote:I still don't get this extra wiring for the rear defrost.  I spotted a Monte Carlo at the DVAP yard today with the electric grid and it had the same three wires running to the alternator as any of the other cars out there.

The additional harness takes original engine harness alternator lead and plugs into new harness, new harness plugs into alternator and goes to 40 amp circuit breaker mounted on firewall and small brown wire goes through firewall grommet to control. You would not necessary notice the add on harness...
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Post by S3SS Fri May 04, 2018 9:05 pm

M & H electric harness I received was completely made like the original. Highly recommend them for any obscure or other harness needed. Great product, great service. My rear heated glass works wonderfully in my laguna now...
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Post by Joe73 Fri May 04, 2018 9:17 pm

S3SS wrote:M & H electric harness I received was completely made like the original. Highly recommend them for any obscure or other harness needed. Great product, great service. My rear heated glass works wonderfully in my laguna now...

X2. M&H is top notch stuff. Even for 4 speed tcs.
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