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08-09-2018, 08:00 PM | #1 |
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Join Date: Aug 2010
Location: Mooresville, NC
Posts: 2,675
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Help identifying a few wires
So, I am working on a 72 Blazer. I got it running and took it around the block but it didn't make it all the way. So, I towed it home and now it is dead in the water.
Clicks but will not crank. While inspecting it, I noticed a few wires that arent connected. Two are melted and look like junk. The other just isnt hooked up. You veterans are gonna probably think these are stupid questions but bear with me. We all gotta start somewhere The first is a yellow wire that comes a harness from the junction box for the fuse panel. It appears that it went somewhere around the starter. It is melted from header heat. Had some insulation on it. The other is a green wire that ran the same route. It also comes from the junction box for the fuse panel in the same harness as the yellow wire (also had another yellow wire that went to the distributor and a purple wire. Crosses over the block and appears to have also connected to something around the starter. It still has a spade connector on it. The third comes from another harness around the distributor. It has a two way flat plug on it. I am gonna upload pics from my phone ... It needs a new harness all together because it is a mess, but like most guys, that isn't gonna happen right now.
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Jeff 1972 Blazer CST 2wd- My son Sam's Project "S" Project "S" 1970 Suburban - SOLD "One Bad Burb" Photobucket Album 1986 C30 Crewcab - 63K original miles, original paint Members I have met: mikey531, gcburdic, bashed, burbman69, TonyPieras, Blazester, GCncsuHD, custombuilt67-72, tsnow678, highrpm, PanelDeland, tanman722001, 47thriftmaster, babyblueoval, 68stepbed, JesseWebb, Andy4639, xs-style, TobyArnot, BigOrange, frednoah, brn_agn, k5hart, Graham57a, bhelton, AJohn6, SilverC10, 69CST, '71 Flame, RaceAGMC, Liz, Josh, MattPSU, 68corvair, Chevy350V8, mdeal, ccrorymc, mrhurt73, dmxxpert, Custom68, 84GMC, BionicABs1, BigBlockBurris, Ebfabman, ATP... Last edited by jeffg1010; 08-09-2018 at 08:10 PM. |
08-09-2018, 08:51 PM | #2 |
Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,562
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Re: Help identifying a few wires
You may be able to figure out most of it by looking at the wiring diagram.
http://67-72chevytrucks.com/vboard/s...49#post7809749 It is the pickup truck version, but probably not too different for Blazer. Look at the wire colors and what area of the truck they are located. I think the green wire with cloth cover is the temperature sensor wire. The yellow wire near starter is to provide 12V from the starter to a points distributor during start up, because the points distributor gets lower voltage running power through a resistor wire (white/orange/purple cloth wire) that comes from the firewall connector. If you have an HEI distributor then you are probably not using the yellow wire. |
08-10-2018, 09:23 AM | #3 |
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Join Date: Aug 2010
Location: Mooresville, NC
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Re: Help identifying a few wires
That’s good info. Does anybody have a clue what the flat plug is?
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Jeff 1972 Blazer CST 2wd- My son Sam's Project "S" Project "S" 1970 Suburban - SOLD "One Bad Burb" Photobucket Album 1986 C30 Crewcab - 63K original miles, original paint Members I have met: mikey531, gcburdic, bashed, burbman69, TonyPieras, Blazester, GCncsuHD, custombuilt67-72, tsnow678, highrpm, PanelDeland, tanman722001, 47thriftmaster, babyblueoval, 68stepbed, JesseWebb, Andy4639, xs-style, TobyArnot, BigOrange, frednoah, brn_agn, k5hart, Graham57a, bhelton, AJohn6, SilverC10, 69CST, '71 Flame, RaceAGMC, Liz, Josh, MattPSU, 68corvair, Chevy350V8, mdeal, ccrorymc, mrhurt73, dmxxpert, Custom68, 84GMC, BionicABs1, BigBlockBurris, Ebfabman, ATP... |
08-16-2018, 06:51 PM | #4 |
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Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,819
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Re: Help identifying a few wires
purple wire goes to the starter solenoid also im sure. opposite the yellow wire
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08-16-2018, 10:44 PM | #5 |
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Join Date: Jun 2013
Location: Somewhere
Posts: 3,053
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Re: Help identifying a few wires
Green insulated wire is typically the temp gauge/light but the color wiring diagram would allow you to help yourself.
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08-20-2018, 03:36 PM | #6 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Help identifying a few wires
Purple is starter wire from key switch. The yellow wire is the old resister wire if it has the original dizzy if it's a HEI then it's not needed. Look right around the back of the fuse panel at the yellow wire it should have the fuzzy insulation around it if it hasn't been changed out. That green wire is your coolant temperature wire.
The double plug may have been the anti diesel wiring on a automatic. Not sure of the plug though.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. Last edited by Andy4639; 08-20-2018 at 03:43 PM. |
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