1972 Chevy Ignition Switch Wiring Diagram

Username	Post: color wiring diagram (Topic#253673)
C10 Sleeper Valued Contributor Posts: 3426 Loc: Redding Ca Reg: 03-17-09 User Info Send Private Topic View Profile	12-01-10 04:03 PM - Post#2012220 Here is the link to the 67-72 V8 and cab wiring. http://www.flickr.com/photos/boundstaffpres s/33974... 67-72 chassis and cab wiring. http://www.flickr.com/photos/boundstaffpres s/33966... http://photobucket.com/C10Pictures Email Report

JimKshortstep4x4 Chevytalk Moderator & "16th Year" Silver Supporting Member Posts: 5124 Loc: Muskegon, MI, USA Reg: 03-28-02 User Info Send Private Topic View Profile	12-01-10 05:27 PM - Post#2012255 In response to C10 Sleeper C-10 Sleeper, I posted the two links in the "Chevrolet Data" sticky above so they will be easy to access in the future. Thanks for posting the links. The diagrams are very nice and can be easily expanded. Jim 65 Impala SS, 400sbc, Muncie M-22 66 Impala SS, 396, TH 400 69 El Camino, 350, TH 350 71 Short bed stepside 4x4, 350/TH 350 71 Snow plow, 4x4, 350, TH 350 72 GMC Shortbed, stepside, 427/TH 400 Email Report
C10 Sleeper Valued Contributor Posts: 3426 Loc: Redding Ca Reg: 03-17-09 User Info Send Private Topic View Profile	12-01-10 06:39 PM - Post#2012288 In response to JimKshortstep4x4 I'm happy to help when I can. My knowledge about 67-72 body style isn't all that great yet but I'm still learning. If I can find anything helpful for the people that are interested including myself I will gladly send it this way. Gabe http://photobucket.com/C10Pictures Email Report
tnoftsger Forum Newbie Posts: 4 Reg: 06-16-11 User Info Send Private Topic View Profile	06-16-11 07:32 AM - Post#2104171 In response to C10 Sleeper Sorry trying to revive a reasonable dead thread, but i have a question about the schematic but, I have gauges and was curious about the black wire w/white stripe at the gauge plug. Does this black w/white stripe labeled "Alternator" replace the 20 gauge brown wire from the bulk head connector to the gauges? Working on my charging system and the brown wire is there on the engine side of the bulkhead. The brown wire w/white stripe is connected to the brown at the bulkhead, but i have no continuity between the brown and the black w/white stripe under the dash Email Report
JimKshortstep4x4 Chevytalk Moderator & "16th Year" Silver Supporting Member Posts: 5124 Loc: Muskegon, MI, USA Reg: 03-28-02 User Info Send Private Topic View Profile	06-16-11 05:06 PM - Post#2104362 In response to tnoftsger Welcome to Chevy Talk from West Michigan! The brown wire that sends a signal to the alternator comes from the ignition switch. The black wire with the white stripe goes to one side of the ammeter. I am not sure why it is labeled alternator. The brown wire should read a voltage with the key on and since it is a resistor wire it will probably read less then 12 volts. Jim 65 Impala SS, 400sbc, Muncie M-22 66 Impala SS, 396, TH 400 69 El Camino, 350, TH 350 71 Short bed stepside 4x4, 350/TH 350 71 Snow plow, 4x4, 350, TH 350 72 GMC Shortbed, stepside, 427/TH 400 Email Report
tnoftsger Forum Newbie Posts: 4 Reg: 06-16-11 User Info Send Private Topic View Profile	06-17-11 11:43 AM - Post#2104690 In response to JimKshortstep4x4 The black w/white stripe does go the guage(ammeter), it is the other end i'm curious about. I borrowed an original service manual and i think the black w/white stripe returns to the bulk head connector and becomes a black w/double white on the engine side. From the bulkhead back down to the red wire (12 gauge) that is attached to the alternator post. Can anybody confirm this? Wiring diagrams are not my best subject. Email Report
C10 Sleeper Valued Contributor Posts: 3426 Loc: Redding Ca Reg: 03-17-09 User Info Send Private Topic View Profile	06-17-11 02:38 PM - Post#2104774 In response to tnoftsger Wiring diagrams aren't my thing either but for me these color diagrams that can be opened up rather large are about the easiest I have found. Jim is way more knowledgeable than I am on these trucks and if someone here can give you the right answer he's one of them. I do have a question though. You say your truck has an alternator or a generator? I'm thinking if you have an alternator someone in the past has made some changes possibly maybe part of the reason the diagram and your wiring aren't matching up. Just a possible theory since I can't physically see your truck. When I went through the wiring in my truck I had to upgrade the wire for my ignition. I bought the correct terminals to utilize the factory bulk head connector. If you didn't really know what you were looking at or didn't pay close attention you would never know the difference. So I'm making a possible assumption if things were changed and done by someone that wanted to do a nice job you might not notice they didn't use the proper color etc. That's just my theory it doesn't mean its right or wrong but worth investigating. http://photobucket.com/C10Pictures Email Report
JimKshortstep4x4 Chevytalk Moderator & "16th Year" Silver Supporting Member Posts: 5124 Loc: Muskegon, MI, USA Reg: 03-28-02 User Info Send Private Topic View Profile	06-17-11 05:03 PM - Post#2104836 In response to tnoftsger The two wires from the ammeter on the original wiring routes to the bulkhead connector and from there they connect to the power wire that feeds the cab. If you look on both sides of the radiator you should find two football shaped fuse holders. The one for the wire to the passengers side is connected to the terminal block on the fender where the large red wire is connected. The driver's side is connected to the power feed inside the harness. The two wires from the gauge are set up so that the gauge receives a very low voltage because of the resistance in the feed wire over the approximate (3) feet of the power feed. The ammeter wires have nothing to do with the alternator's functioning. Hopefully I have not confused you! Jim 65 Impala SS, 400sbc, Muncie M-22 66 Impala SS, 396, TH 400 69 El Camino, 350, TH 350 71 Short bed stepside 4x4, 350/TH 350 71 Snow plow, 4x4, 350, TH 350 72 GMC Shortbed, stepside, 427/TH 400 Email Report
tnoftsger Forum Newbie Posts: 4 Reg: 06-16-11 User Info Send Private Topic View Profile	06-20-11 07:15 AM - Post#2105712 In response to JimKshortstep4x4 Well, I got the alternator working, finally!!! Now the ammeter moves, but never gets anywhere close to charging. Starts on the far left and moves even more left when the starter engages and then slightly right after the motor starts and moves around a little while running. Could it be the resister in the wire is bad? Edited by tnoftsger on 06-20-11 07:20 AM. Reason for edit: No reason given. Email Report
tnoftsger Forum Newbie Posts: 4 Reg: 06-16-11 User Info Send Private Topic View Profile	06-20-11 08:34 AM - Post#2105745 In response to tnoftsger no that i think about it... the ammeter stays on the far left "discharge" when removed from the truck. It should "center" in the absence of and input. Maybe someone has had it apart. Email Report
JimKshortstep4x4 Chevytalk Moderator & "16th Year" Silver Supporting Member Posts: 5124 Loc: Muskegon, MI, USA Reg: 03-28-02 User Info Send Private Topic View Profile	06-20-11 03:50 PM - Post#2105927 In response to tnoftsger It is possible that the needle got bent at some time so you may want to try centering it. If you cannot center it then you will need to get another one. Jim 65 Impala SS, 400sbc, Muncie M-22 66 Impala SS, 396, TH 400 69 El Camino, 350, TH 350 71 Short bed stepside 4x4, 350/TH 350 71 Snow plow, 4x4, 350, TH 350 72 GMC Shortbed, stepside, 427/TH 400 Email Report