70 BB engine wiring harness ques - Chevelle Tech
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post #1 of 6 (permalink) Old Nov 2nd, 19, 10:27 AM Thread Starter
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70 BB engine wiring harness ques

I picked up a new engine wiring harness for a 70 BB chevelle w out AC, to replace the old one that was hacked up. The car is a SS tribute and I’m sure the harness that was there was from the 307 Malibu days. Can someone help identify a couple wires? I don’t have a wiring diagram as of yet... I believe the two single connector wires are for cowl induction, which I don’t have . The blue w boot connector oil pressure, but how about the other 2 wire boot? Looks like maybe a temp sender but I though the temp sender came from the forward light harness? It also has a clip to be fastened somewhere..Any help is much appreciated
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post #2 of 6 (permalink) Old Nov 2nd, 19, 12:45 PM
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Re: 70 BB engine wiring harness ques

Yes, agree, the blue wire w/ the boot is oil pressure sending unit above the oil filter. The plug in the middle looks to be for the kickdown (TCS) switch on a Turbo 400. Located above the pan on the back left (drivers side) corner. The metal bracket on the wire goes behind the second from the bottom transmission bolt head on the drivers side. The 2 plugs on the right could be for the cowl hood, but I'm thinking the (TCS) switch on the top portion of the gas pedal under the dash. This activates the kickdown (passing gear) at WOT. There should be a hole in the firewall for it. Look in AIM. There is a picture with all the holes in the firewall somewhere in that book.

Chris

Last edited by Jayhawk500; Nov 2nd, 19 at 1:02 PM.
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post #3 of 6 (permalink) Old Nov 2nd, 19, 1:15 PM Thread Starter
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Originally Posted by Jayhawk500 View Post
Yes, agree, the blue wire w/ the boot is oil pressure sending unit above the oil filter. The plug in the middle looks to be for the kickdown (TCS) switch on a Turbo 400. Located above the pan on the back left (drivers side) corner. The metal bracket on the wire goes behind the second from the bottom transmission bolt head on the drivers side. The 2 plugs on the right could be for the cowl hood, but I'm thinking the (TCS) switch on the top portion of the gas pedal under the dash. This activates the kickdown (passing gear) at WOT. There should be a hole in the firewall for it. Look in AIM. There is a picture with all the holes in the firewall somewhere in that book.
Thanks for that info!
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post #4 of 6 (permalink) Old Nov 2nd, 19, 1:21 PM Thread Starter
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Ok one more. The green wire w the gray connector ( I think )plugs into the headlight harness. At least the original harness did so. The black and blue wires with the double flat and wide connector I’m not sure of.
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post #5 of 6 (permalink) Old Nov 2nd, 19, 1:40 PM
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Re: 70 BB engine wiring harness ques

Second and fifth pictures are the cowl induction wiring harness. It's an add on harness to the engine harness just as is the a/c harness. The trans kick down and cowl induction door are served by the same switch located above the throttle pedal.

Down load the attachments and you'll be able to zoom in on them and have a pretty decent SS wiring diagram. The sweep dash diagram has some minor differences. The last PDF is for the sweep dash cars, non ss or cars without the optional U14 GAUGE PACKAGE.

TCS wiring is included in the attachments.
\
There's a black and blue that run to the TCS solenoid.
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File Type: pdf W - Chevelle El Camino 1970-72 (SWEEP DASH) Instrument Panel Wiring Diagram.pdf (78.8 KB, 8 views)

Last edited by DUTCH MAX HEADWORK; Nov 2nd, 19 at 1:57 PM.
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post #6 of 6 (permalink) Old Nov 2nd, 19, 3:25 PM Thread Starter
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Quote:
Originally Posted by DUTCH MAX HEADWORK View Post
Second and fifth pictures are the cowl induction wiring harness. It's an add on harness to the engine harness just as is the a/c harness. The trans kick down and cowl induction door are served by the same switch located above the throttle pedal.

Down load the attachments and you'll be able to zoom in on them and have a pretty decent SS wiring diagram. The sweep dash diagram has some minor differences. The last PDF is for the sweep dash cars, non ss or cars without the optional U14 GAUGE PACKAGE.

TCS wiring is included in the attachments.
\
There's a black and blue that run to the TCS solenoid.
Thanks Dutch max. I’ll print it out when I get home
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