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Post Info TOPIC: How does all this connect up to the fusebox?


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How does all this connect up to the fusebox?


If anyone has a '69 power window convertible, I'd love to compare notes!  Or I'll also accept wild guesses.

The Convertible Top and the Power Windows both need IGN power.  I assume that might be what the 3-1 splitter is about.  But what's with the red thing, and why does it block access to whatever port is below what it's plugged into?  It's clearly intentional, but for what purpose?

Also the red Convertible switch connector doesn't seem to plug directly into the fusebox.  Does it go to the red power connector coming out by the harness?

Or if any of this is just in a book I could be looking at, point me at the book, but I found only wiring connection diagrams, not harness stuff.

Here's what I have:

IMG_5908.JPG



-- Edited by davepl on Sunday 4th of February 2018 10:46:39 AM

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Canadian Poncho Superstar!

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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.



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72 GMC Sierra

 

 



Canadian Poncho Superstar!

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Here's a photo of the Power Top & Power Side Windows wiring from my 1970 US Pontiac Service Manual.

The "Cir. Bkr. on Fuse Block" in the bottom left corner is the circuit breaker on the firewall that comes from the horn relay.

70 Power Top & Power Side Windows.jpg



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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

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Canadian Poncho Superstar!

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I've got the whole power window setup from the 69 2+2 hdtp I parted out, but it's up in the rafters of my garage. I can get it down when things warm up.

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72 GMC Sierra

 

 



Canadian Poncho Superstar!

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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.

70 Pontiac power top harness.JPG



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A Poncho Legend!

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Clint, I assume that the power wire off the battery to the horn relay has a fuseable link? If not, that would be scary.

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

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A Poncho Legend!

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Oh, that's nicer than on 66 where it's part of the wire. It always has issues and I keep seeing where people just delete it and put wire there. I don't think they realize the hazard.

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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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John

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and a 1969 Canadian 2+2



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Yup, our cars are a mix of Chevrolet, Pontiac and other parts.

John, can you check your 1969 US Pontiac Service Manual to see if the "Power Top & Power Side Windows" drawing is the same as my post earlier today? It should be in Section 12, Chassis Electrical.

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A Poncho Legend!

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North wrote:

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





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

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American pontiacs do not have any extra wires on the battery cables, neither to the ground or that positive power block. All US pontiacs have an extra power plug to supply accesory power besides the positions available in the fuse block, the male plug is orange-red on a orange wire and is typically poking out of the dash harness a few inches from the fuse block.

I'll check my manual tonight

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seventy2plus2 wrote:

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.

70 Pontiac power top harness.JPG


 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!

 



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North wrote:

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


I can't for the life of my figure out why a Canadian Parisienne doesn't use the same engine harness as a US Impala.  The engine harness portion should be identical. Even the front light harness should be the same, four headlights and a marker light.  But I don't think they are.

If they were, the engine harness is one I'd replace.  The rest I will restore, but the engine one gets baked on heat cycles for 50 years.

 



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A Poncho Legend!

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

I only learned that recently.

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OK now -that- is weird. What could be different I wonder? No metric or french at that point, so... beyond me!

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A Poncho Legend!

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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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I didnt find the drawings yet for the various accessory plugging sequences but this may ne of use.  Note that it refers to that accessory plug that is near the fuse block.

chassis1.jpeg



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John

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

chassis2.jpeg

chassis3.jpeg



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John

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Thanks! Looking just at the "Power Top and Side Windows" section I notice that Clint's shows the 3->1 connector that I'm faced with but John's does not. Otherwise they seem the same.

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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.

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John

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My GMC has quite a few options and it's a daisy-chain of those extenders; I'd never seen a 3->1 before. I guess as you note I don't need it as long as I can live with no ACC terminal being available for use.

On my coupe I actually plug that into BAT so that the power windows work when the key is off. I presume that's a safety or theft concern, but I find it convenient!

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Carl Stevenson wrote:

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.


 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.



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If you run your power windows with both plugs in the battery connections youll always run down the battery because it will keep the relay energized.

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John

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and a 1969 Canadian 2+2

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