What did I get myself into? - Page 2 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #16 of 24 (permalink) Old Mar 31st, 12, 8:44 PM Thread Starter
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Don
 
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Location: Aylmer Ontario Canada
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Re: What did I get myself into?

Quote:
Originally Posted by LevonH View Post
Hi Don.
Do you have the wiring diagram(s) It is sooooo much easier with them.

www.Classiccarwiring.com does some great ones in colour.

Otherwise it may be a pain trying to explain some of this. Post pictures as you go and that will help with the explanations that you are seeking.

Levon
Thanks but I don't have that particular diagram, the one I have is from "Peach State Chevelles" web site. I just had a look at the one they have on their site for the '72's and it matches the one in my car. The wiper connections are on the other half of the bulk connector. I guess I'll have to send this one back and get one for a '72. What a piss off!!!


Quote:
Originally Posted by Coppertop View Post
I believe the tip-off of whether you have a '71 harness or '72 harness (dash harness that is)...is the wiper switch.

The 1971 harness is like the '70's....the wiper switch has the dark blue, the black, and the light blue apart of the plug.

The 1972 has an integrated ground that is offset from the main three terminals mentioned above. So it has a 4 terminal plug.........
Coppertop
Thanks for the pointer but as you can see in my response to Levon I found out which one I have.
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post #17 of 24 (permalink) Old Mar 31st, 12, 9:01 PM
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Bob
 
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Re: What did I get myself into?

NOTE: Your car is a 71 with A/C, NOT a 72. You have TWO relays under your glove box, What do they do???? When you shut the key off, One of the relays sends power to the A/C clutch for a short time. WHY??
This my friend was the " New and Improved Anti Dieseling System " for 1971.
When you are all done with your wiring try this. With the engine running ( In a quiet place) Turn the Ign. OFF and pull the key out of the column. NOW LISTEN........ You will hear a CLICK,, The A/C clutch has just engaged, ( This puts an extra load on the engine, So it will not DIESEL )
KEEP QUIET and LISTEN ! WHY?--- In a few seconds you will hear another CLICK, Whats That??? --Its the timer relay shutting the power off to the A/C Clutch. Remember all of this is done when the KEY is in your hand and not in the IGN.
Bob

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post #18 of 24 (permalink) Old Apr 1st, 12, 10:17 PM
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Phil
 
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Re: What did I get myself into?

The wiper wires are part of the engine harness on the 71, not the forward lamp (light) harness. Sounds like you unknowingly might have started a complete rewiring of your whole car.

Edit... Sorry, I didn't see the last two posts before posting this.

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post #19 of 24 (permalink) Old Apr 2nd, 12, 5:22 AM Thread Starter
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Don
 
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Re: What did I get myself into?

Quote:
Originally Posted by Robinls5 View Post
NOTE: Your car is a 71 with A/C, NOT a 72. You have TWO relays under your glove box, What do they do???? When you shut the key off, One of the relays sends power to the A/C clutch for a short time. WHY??
This my friend was the " New and Improved Anti Dieseling System " for 1971.
When you are all done with your wiring try this. With the engine running ( In a quiet place) Turn the Ign. OFF and pull the key out of the column. NOW LISTEN........ You will hear a CLICK,, The A/C clutch has just engaged, ( This puts an extra load on the engine, So it will not DIESEL )
KEEP QUIET and LISTEN ! WHY?--- In a few seconds you will hear another CLICK, Whats That??? --Its the timer relay shutting the power off to the A/C Clutch. Remember all of this is done when the KEY is in your hand and not in the IGN.
Bob
Thanks Bob. But if what your saying is true then why are the plugs for those two items on the engine wiring harness rather than behind the dash? They will not go in through the firewall.
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post #20 of 24 (permalink) Old Apr 2nd, 12, 8:44 AM
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Levon
 
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Re: What did I get myself into?

Post a picture of your new harness and the plugs. There are relays on the firewall with these cars. One is for the TCS (Transmission controlled spark) and it uses 2 plugs. 1 at the firewall and 1 at the pass side front of the engine. Maybe that is what you are seeing???

Levon Hovagimian
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post #21 of 24 (permalink) Old Apr 2nd, 12, 6:44 PM
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Bob
 
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Re: What did I get myself into?

NOTE:
The 71 A/C harness----- It is a stand alone harness. It has nothing to do with the under dash or under hood harness.
As always, Some times they get hacked into by someone looking for a " HOT WIRE ". This is another problem to deal with.
Bob

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post #22 of 24 (permalink) Old Apr 2nd, 12, 8:03 PM Thread Starter
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Don
 
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Re: What did I get myself into?

Levon
Probably won't be working on the car until Friday. The car is in a friends shop and it's 20 min. away. I'll take some pictures and post them then.
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post #23 of 24 (permalink) Old Apr 2nd, 12, 8:28 PM
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Levon
 
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Re: What did I get myself into?

OK.
Have a great week.

Levon Hovagimian
Team Chevelle #279
70 Chevelle SS 454 LS5 4 speed.
Current Engine VortecPro 460 (513 HP) Original is resting
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post #24 of 24 (permalink) Old May 5th, 12, 7:23 AM Thread Starter
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Don
 
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Re: What did I get myself into?

It's been a while since I've posted. I went back to my old harness and started from scratch. I used the wiring diagram I have and traced everything I needed and eliminated the wires not needed (after everything was working correctly). I left the horn relay on the firewall because it worked out better for me. I know it's not correct but it seemed much easier than extending more wires to the rad support. I hid most of the wiring behind the engine rather than up on the firewall for a bit of a cleaner look. Now all I have to do is reinstall my MSD and Tach Adapter and it should be good but that can wait for a later time as I have a Pertronix Flame Thrower distributor in the mean time. I'll post a few pics later.

Oh yeah the vendor I got my AAW wiring harness from wouldn't take it back as it was a special order, so if anyone needs a '71 engine wiring harness I have one for sale.
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