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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: Irish_Alley on March 03, 2017, 02:41:13 AM

Title: wire identification
Post by: Irish_Alley on March 03, 2017, 02:41:13 AM
not mine and cant really help out on year. ill try to get the info but what so these wires do
Title: Re: wire identification
Post by: Stewart G Griffin on March 03, 2017, 07:23:04 AM
Only guessing, but the two plugs may be fast idle solenoid and A/C.   Not sure about the ring.
Title: Re: wire identification
Post by: Captkaos on March 03, 2017, 07:32:42 AM
what is the application?  Lockup switch and Starter power wire?
Who's is this and where is it coming from?
Title: Re: wire identification
Post by: Irish_Alley on March 03, 2017, 08:22:39 AM
facebook local.
Title: Re: wire identification
Post by: harcorshe on March 03, 2017, 09:10:43 AM
Based on the location, size, and color, it looks like the feed to the A/C blower relay, but it should have a Packard Series 56 connector instead of a ring. 
Title: Re: wire identification
Post by: bd on March 03, 2017, 09:45:05 AM
(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=34654.0;attach=35070;image)

Looking at the red and purple starter wires laying on the framerail and running toward the battery instead of toward the firewall; wondering whether the green and red wires being held for display are freshly taped; seeing the battery cable laying loose on top of the framerail instead of securely anchored to the framerail with an Adele clamp (which is catastrophe waiting for opportunity), imply the wiring maybe a work in process.  The ring terminated red wire could be the B+ feed from the starter to the firewall junction block.  The green pair maybe A/C and idle solenoid, or converter lockup, as previously suggested.  Post the year/model information, a description of the situation and what the owner is trying to accomplish, and maybe some pics that provide a better overall for fewer guesses.
Title: Re: wire identification
Post by: Irish_Alley on March 03, 2017, 10:02:42 AM
found out its a 86 k something that had a 305 now has a 350.
Title: Re: wire identification
Post by: Irish_Alley on March 03, 2017, 10:04:56 AM
that was a typo last night also should of been "what do these wires do". i can see the b+ red wire going to the starter, the other ones i was thinking ac. but i was thinking the ac plugs are round
Title: Re: wire identification
Post by: Irish_Alley on March 03, 2017, 01:39:41 PM

from the owner after i asked, does it start? "Yeah runs drives blower motor runs heat works"
Title: Re: wire identification
Post by: bd on March 03, 2017, 03:59:36 PM
that was a typo last night also should of been "what do these wires do". i can see the b+ red wire going to the starter, the other ones i was thinking ac. but i was thinking the ac plugs are round

If the wires entering those two connectors are light green and light blue, they are for the lockup converter circuit on an MD8 (according to the 1986 Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_352_86_1986_Chevrolet_GMC_Light_Truc_Wiring_Manual_CK_10_30_Only.pdf#page=15), page 15).  If that's true and the red wire is bundled in the same taped loom with the green & blue wires, then the red wire probably connects to the firewall junction block.  Is the charging system working?

Does the owner have a problem with his truck or _________?
Title: Re: wire identification
Post by: Irish_Alley on March 03, 2017, 04:04:05 PM
when i get home im going to give him a link to this page so im not being a middle man and he can give you better and correct info. also i thought he said it was and still is a manual
Title: Re: wire identification
Post by: Irish_Alley on March 04, 2017, 01:32:21 PM
owner is working on getting registered
from him
They trace back to the wires directly to the right of the heater box truck is a ac truck
Title: Re: wire identification
Post by: Captkaos on March 05, 2017, 10:06:42 PM
All have been approved, just need to activate.
Title: Re: wire identification
Post by: Matt_lngoerp on March 06, 2017, 06:12:04 AM
Hello everyone sorry for the delay OK the truck is a 86 k10 was a 305 truck now has a 350 trans is a A-883 3speed overdrive stick shift it has ac non cruise truck these wires come out of fire wall directly to the left of the HVAC box it's not a starter wire almost certain will not reach truck runs and drives fine I drive everyday but who ever touch the wire harness was a hack and im just tying to get it back to how it's supposed to
Title: Re: wire identification
Post by: Matt_lngoerp on March 06, 2017, 06:42:19 AM
They come out directly to the right of the HVAC not the left sorry about that
Title: Re: wire identification
Post by: bd on March 06, 2017, 09:28:26 AM
Welcome to the site!

Left and right are always from the driver's perspective - left is driver side, right is passenger side.  Does the HVAC blower work on high?  What are the wire colors in the two plugs (some of the wires are obstructed in the posted image)?
Title: Re: wire identification
Post by: Matt_lngoerp on March 06, 2017, 12:09:27 PM
No the blower does not work on high it does however work on the first three and the exit just to the driver side of the HVAC box
Title: Re: wire identification
Post by: bd on March 06, 2017, 02:21:56 PM
With that in mind, the 10-gauge red wire with the ring terminal end is probably the B+ feed to the high blower relay.  If you have a DVOM check for B+ on the red wire at the blower relay.  If it's dead, jumper the ring terminal to the firewall junction block and recheck for voltage on the red wire in the blower relay connector.  If the red wire proves to be the relay feed, then the green wires feed the A/C low pressure cycling switch and idle solenoid.
Title: Re: wire identification
Post by: Matt_lngoerp on March 06, 2017, 05:33:47 PM
Sweet I will check when I get home OK so now I have a few more electrical problems 1 on the wire harness what color wires feed what gauge ......None of my gauges work and would like to keep all factory gauges 2 my fuel gauge didn't work when I got the truck fuel gauge didn't work I pulled bed off well the pink wire on sender was unplugged I plugged it in and fuel gauge worked perfect well I went to put gas in it after that tank was empty and when I got back in gauge was on empty I tried a different gauge and same prob idk what is going on with it
Title: Re: wire identification
Post by: bd on March 06, 2017, 06:00:40 PM
For details on wiring colors and connections, download the 1986 Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_352_86_1986_Chevrolet_GMC_Light_Truc_Wiring_Manual_CK_10_30_Only.pdf) to your PC.

If none of the gauges work, begin by checking the fuses.  If the fuse is good, unplug the tank sending unit.  Does the gauge swing past Full to ~3:00 o'clock?
Title: Re: wire identification
Post by: Matt_lngoerp on March 07, 2017, 04:35:26 AM
Someone cut the wires outta the truvk so I have about 6 inches of wire by the firewall
Title: Re: wire identification
Post by: Irish_Alley on March 08, 2017, 07:31:22 AM
the pink wire is cut?
Title: Re: wire identification
Post by: Matt_lngoerp on March 09, 2017, 05:42:17 PM
No the pink wire is there but all the others for the gauges are temp oil press and im guessing the volt gauge are all cuti have no gauges
Title: Re: wire identification
Post by: bd on March 09, 2017, 05:58:48 PM
Voltmeter connections are all internal to the cab, behind the instrument cluster.  Engine coolant temp wiring is dark green, engine oil pressure is brown.  Have you looked at the factory wiring manual I linked or had a chance to try any of the suggestions for the fuel gauge?