Dave, a source for you may be both the Cdn Pontiac Acadian Beaumont Chassis Shop Manual & the US Service Manual. What I've done is photocopy the electrical drawings from the Electrical - Body and Chassis in the Cdn manual, then taped them together to make a contiguous drawing. I then photocopied it as an 11x17 drawing, and had it laminated. It's of great help, and shows the connectors for power top.

The US Service Manual has better drawings for accessories like power windows in its Chassis Electrical section.

Also, he ignition doesn't need to be on for power top.

By looking at the drawing for my 70, the power wire comes from the horn relay via a 10 gauge black wire, to the circuit breaker mounted on the firewall, then a 10 guage orange/black wire through the firewall grommet, to the 3 way splitter. I think then the short orange/black wire plugs into it, and the red plug of the power top harness then plugs into the red Y connector. You've basically laid it out properly. If you're missing the 10 gauge black wire & circuit breaker, I think I have one.

I looked at my 70 US Pontiac Service Manual, it has a small drawing specific to Power Top & Power Side Windows. It references the "Circuit Breaker on Fuse Block", which is the breaker on the firewall as a power source, but also shows the power windows getting power from the Accessory feed at the fuse block.

Ah, OK, I might be missing that. I see there should be a black wire that runs from the horn relay to a breaker on the firewall, and then through a grommet, and then into the interior. I guess I'll be making that, though I do have a cut grommet on an orange wire that might be it...

Thanks for the help!

My power window harness has a large power breaker or relay on it.  Anyone know what that's about? It's four wires, so not just a breaker, but why a relay up at the front of the harness?  That only saves the run from the horn relay, so wouldn't up the amperage much at all.  Not sure what it's for yet.

-- Edited by davepl on Sunday 4th of February 2018 01:53:21 PM

-- Edited by davepl on Sunday 4th of February 2018 01:53:48 PM

Here's what the wire looks like that connects to the horn relay, and the circuit breaker that mounts on the firewall.  I may have taken this from the 70 Safari Estate wagon that I grabbed for the motor about 10 years ago.  Either way, it's the same whether it's for a wagon rear window or the convertible power top.  That's the power source for your power top and power windows, but as seen above the windows will also connect to the fuse block to only work with ignition on.

Yup, there's a fusible link right at the battery to a small junction block that feeds over to the horn relay.

It seems like Canadian cars are wired ala Chevy Impala. Its a very different set up on American models.

North wrote:

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It seems like Canadian cars are wired ala Chevy Impala. Its a very different set up on American models.

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I think part of that may be due to the starter being on the opposite side of the engine, so the battery moves over.

seventy2plus2 wrote:

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Here's what the wire looks like that connects to the horn relay, and the circuit breaker that mounts on the firewall.  I may have taken this from the 70 Safari Estate wagon that I grabbed for the motor about 10 years ago.  Either way, it's the same whether it's for a wagon rear window or the convertible power top.  That's the power source for your power top and power windows, but as seen above the windows will also connect to the fuse block to only work with ignition on.

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 I've got the OTHER end of that, the orange wire.  The bracket is kind of unique but otherwise I think I could fab that up.  It'd be nice to have your original if you care to part with it, or if someone has a parts wagon out in the yard!  But I'm going to need so many parts I'm trying not to start asking much yet!

 

Apparently even the Canadian Impala and US Impala don't share that forward harness. Crazy.

I only learned that recently.

The harness comes up and over the rad spacer in Canada and runs down low in the US. Now this may not be true through 69 but I read on a US Chevy forum that they were made that way. I had never noticed and I spend a lot of time in a Minnesota yard full of 60's B bodies.

 

Here you go, from the 69 American B Pontiac assembly manual.

You dont need the three way, perhaps they used it as practice in Canada to make it easier to add dealer options but just use the 2-1 jumper for battery power plugs and the power window relay plug goes in the accessory position that has no power when ignition key is in lock position.

Carl Stevenson wrote:

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The harness comes up and over the rad spacer in Canada and runs down low in the US. Now this may not be true through 69 but I read on a US Chevy forum that they were made that way. I had never noticed and I spend a lot of time in a Minnesota yard full of 60's B bodies.

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 Can't speak to other years but that is true for 65 Chevs and Pontiacs ( and maybe Beaumonts ). In Canada the harness runs in a plastic(?) channel similar to the foot long piece on the firewall.