Mach1 Driver 587 Report post Posted July 11, 2017 BSWOR you should consider pinning this post. A REAL Schematic Until now there were no entire car schematics for our cars, only wire diagrams. This schematic is 5 pages in four separate pdf files (a quirk of my CAD software). A real schematic rarely makes any attempt to identify wires or plugs or connectors. A real schematic tries to show the internal workings of a component when it helps to explain a circuit. A real schematic simplifies. A real schematic is used when you want to understand how a circuit works. A real schematic is what the designer makes first, then he converts it to a wire diagram. A wire diagram shows where wires go and how to connect them. You need BOTH to work on a car, unless the wire diagram is just so darn simple you don’t need the schematic. Our electrical systems consist mostly of switches and lights; around 44 and 41 respectively. Switches are either open or closed. This schematic only shows when a switch is closed. Usually that is indicated by a few simple words below the switch like on, off, run, start, etc. Pay attention to the top section of page one. It shows the most often used symbols on the schematic. I started this project so I could calculate the electrical loads and know what size alternator to get for my future needs (EFI, fuel pump, halogen lights, power windows, etc.) Amperage information for a stock 1969 Mach1 is in an accompanying spreadsheet (Mustang amps.xls) along with a chart of our most common electrical load: light bulbs. If you don’t like the loads I used to calculate “Likely constant amp draw”, by all means alter the spreadsheet to suit your needs, or use simple math- just don’t complain to me. My hope is that this schematic and spreadsheet become valuable reference tools for other hobbyists. Edit: I've seen quite a few questions about the 1970 turn signal circuit so I started another topic for "1970 Mustang Exterior lights". Edit, it is now six years later and long past time to post the most current revisions. The site has been down for "Bandwidth Limit Exceeded" many times, so I have added a method to view the schematics and other technical documents: https://drive.google.com/drive/folders/10FqYlsGT1XXr8B5TCF9WAASkU4vdPtuJ?usp=sharing Mustang amps.xls MUSTANG SCHEMATIC PG4 REV5.pdf MUSTANG SCHEMATIC PG3 REV6.pdf MUSTANG SCHEMATIC PG2 REV5.pdf MUSTANG SCHEMATIC PG1 REV5.pdf MUSTANG SCHEMATIC PG5 REV5.pdf TABLE OF CONTENTS 69 MUSTANG SCHEMATIC.pdf 5 mackseal, JayEstes, bigmal and 2 others reacted to this Quote Share this post Link to post Share on other sites
RPM 1,232 Report post Posted July 11, 2017 Wow! Thanks for sharing, and your time spent. Quote Share this post Link to post Share on other sites
bigmal 229 Report post Posted July 11, 2017 Wow, this is great stuff. And perfect timing for me as I am doing some rewiring with the right hand drive conversion as well as separating the blinkers from the brake. Thanks. 1 marianabd16 reacted to this Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted July 11, 2017 Glad I could help. 1 bigmal reacted to this Quote Share this post Link to post Share on other sites
Midlife 834 Report post Posted July 11, 2017 Great stuff! Truly well done! Now get to work on 64.5-68, and 70-73! And don't forget non-ammeter configurations. 1 JayEstes reacted to this Quote Share this post Link to post Share on other sites
69RavenConv 301 Report post Posted July 12, 2017 Nicely done. I'm an electrical engineer myself and the archaic diagrams from the factory have always been a source of frustration. Thank you, I pinned the thread, I don't think Ben will mind. 1 marianabd16 reacted to this Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted July 12, 2017 10 hours ago, Midlife said: Great stuff! Truly well done! Now get to work on 64.5-68, and 70-73! And don't forget non-ammeter configurations. Awww, hmmm, no I don't think so. When I own one I'll make the extra effort. 2 edwardfb18 and RPM reacted to this Quote Share this post Link to post Share on other sites
JayEstes 173 Report post Posted July 14, 2017 Awesome stuff! Thanks! Quote Share this post Link to post Share on other sites
bigmal 229 Report post Posted July 14, 2017 I was studying the scheematic today as I could not for the life of me work out how a Mustang is wired for the brake lights to flash as blinkers. Not legal in Australia. The diagram was extremly helpful and I will now have no problem splitting them. Thanks again Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted July 14, 2017 Yes the turn signal switch and 1157 bulbs make for a tricky little circuit. Its something you can never figure out from a wire diagram. The Schematic simplifies that. Glad to help. BTW, things get real interesting when you loose the ground to one of those 1157 bulbs- then it searches for ground by passing through other bulbs and lighting them up. You should be able to follow the path and see what is happening on the Schematic. 1 1 bigmal and ScottAgoca reacted to this Quote Share this post Link to post Share on other sites
aslanefe 342 Report post Posted July 16, 2017 Great work, thanks a lot. Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted July 16, 2017 7 hours ago, aslanefe said: Great work, thanks a lot. Hey another Georgian, welcome to the insanity. What'cha driving? Quote Share this post Link to post Share on other sites
aslanefe 342 Report post Posted July 16, 2017 10 minutes ago, Mach1 Driver said: Hey another Georgian, welcome to the insanity. What'cha driving? Thanks. I have a few '69 and '70s. '70 T5 Grande, '69 Grande, '69 coupe, '69 fastback, '70 convertible, and '70 XR7 Cougar. Only the T5 is in good running and presentable condition at the moment, I have not driven the others for a long time and now they are project cars. Currently working on the '69 Grande, fixing a few dents and a few rusted spots. Hoping to get that on the road this year. 1 JayEstes reacted to this Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted July 16, 2017 1 minute ago, aslanefe said: Thanks. I have a few '69 and '70s. '70 T5 Grande, '69 Grande, '69 coupe, '69 fastback, '70 convertible, and '70 XR7 Cougar. Only the T5 is in good running and presentable condition at the moment, I have not driven the others for a long time and now they are project cars. Currently working on the '69 Grande, fixing a few dents and a few rusted spots. Hoping to get that on the road this year. Wow a whole stable of ponies! Ah, but nothing is real without pictures- let us see your babies. 1 1 JayEstes and ScottAgoca reacted to this Quote Share this post Link to post Share on other sites
aslanefe 342 Report post Posted July 16, 2017 Not much of a photo person. These are what I can find that are decent quality; 2 of the "70, one of "69 Grande. 3 mwye0627, JayEstes and Mach1 Driver reacted to this Quote Share this post Link to post Share on other sites
Grabber70Mach 108 Report post Posted July 21, 2017 @Mach1 Driver Thanks for aall the hard work doing this. I'm getting a 2C171/1 error when trying to download the 4th one. Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted July 21, 2017 5 hours ago, Grabber70Mach said: @Mach1 Driver Thanks for aall the hard work doing this. I'm getting a 2C171/1 error when trying to download the 4th one. You are welcome, and yes it took some work. It downloads for me- anyone else have trouble downloading page 4? Quote Share this post Link to post Share on other sites
Midlife 834 Report post Posted July 22, 2017 Yes; when I try to pull it up it says page not available 2c171/1 error. Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted July 22, 2017 Try now please, I deleted page 4 and uploaded a new copy, and again it works fine for me. Quote Share this post Link to post Share on other sites
Midlife 834 Report post Posted July 22, 2017 Works for me! Quote Share this post Link to post Share on other sites
Grabber70Mach 108 Report post Posted July 24, 2017 Worked this tome, Thanks again. Quote Share this post Link to post Share on other sites
Vicfreg 787 Report post Posted September 15, 2017 Nicely done. I am a control systems engineer, and used to work off of drawings like this during my younger days. I love it. Quote Share this post Link to post Share on other sites
RPM 1,232 Report post Posted September 15, 2017 Man, all you brainiacs here are giving me an inferiority complex :( Quote Share this post Link to post Share on other sites
Mach1 Driver 587 Report post Posted September 15, 2017 Thanks. It took a bit of work, but I just couldn't stand looking at those silly wire diagrams and still not "see" how it works. Now I can just glance at the schematic and think "oh yeah, this is how it works". Back in the day I would only look at a wire diagram if I had to calculate amps for wire gauges or spec terminals or connectors. I would always use a schematic to diagnose a problem. Quote Share this post Link to post Share on other sites
jjstang 55 Report post Posted September 16, 2017 Will be a great help. Thanks for your contribution. 1 Mach1 Driver reacted to this Quote Share this post Link to post Share on other sites
