Finding centerline of roof for cab light install - Ford Powerstroke Diesel Forum

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post #1 of 9 Old 02-14-2011, 04:54 AM Thread Starter
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Exclamation Finding centerline of roof for cab light install

Hey fellas, I have looked all over the net and found many install help guides that have done everything but give a reliable way to find the center. I thought I had found it but once I laid out my last light placements toward the edge they were not of equal measure. I believe it is my center that is off. SO any pointers in finding the center of the roof would help me any many others ( I am sure) greatly. Thanks again!

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post #2 of 9 Old 02-14-2011, 05:11 AM
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Good ole fashion tape measure?

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post #3 of 9 Old 02-14-2011, 05:16 AM
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I just did mine yesterday with the help of my fiance. Not a hard job but needed the help to hold the measuring tape steady. I believe that my roof was 58 1/4 across and halfway was 29 1/8. Center was pretty much directly above the rear view mirror. Yours should be somewhere in that ballpark but every truck is different and how far up from the windshield you measure effects it also. 3 1/2 inches back from the weatherstrip on the windshield. 8 1/4 from center to the 2nd outside lights and 12 1/4 from those to the far outsides. That's what the directions I had said, and I also measured the exact same off my 99 which has the cab lights from the factory. Good luck.

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post #4 of 9 Old 02-14-2011, 06:25 AM Thread Starter
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Thanks Bro. several,l hours yesterday in to the night and I had it all ready to cut. Checked measurements again and it was off on the outer lights. When you measured from the windshield rubber, did you use a straight edge?

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post #5 of 9 Old 02-14-2011, 06:29 AM
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just remember the old saying measure twice cut once...
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post #6 of 9 Old 02-14-2011, 07:09 AM
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Quote:
Originally Posted by korterman1 View Post
just remember the old saying measure twice cut once...
Yeah, because having to cut twice sucks.

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post #7 of 9 Old 02-14-2011, 08:16 AM
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I measured 3.5 inches back pretty much all the way across the windshield. So the would have your lights contoured in an arc also even though they point straight ahead.
Here's a pic I found that helped some.



Lots of measuring though to make sure each side is even.
Here's how mine turned out.




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post #8 of 9 Old 02-14-2011, 09:03 AM Thread Starter
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Excellent, I can't thank you enough for the layout. That was one of the better I have seen and it is for my year truck which helps a lot. It's 65 outside so i will try again.

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post #9 of 9 Old 02-14-2011, 09:08 AM Thread Starter
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To get center I used the two middle ridges the CC has. They were @ 5 inches to the beginning of each ridge which made it 2.5 inches to the middle. It looks dead on so maybe my squaring of the angles to make parallel lines is off. Did I mention I am very OCD about measurements and just taking on a task that requires some "dead reckoning" is hard to do lol.

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Reese 1200 lbs. Straight Line Dual Cam WD

2010 Rockwood 8317RKSS Travel Trailer @ 33' and 8200 Lbs. GVWR

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