Need some quick electrical help

[Russell]

Hey fellas!

I've got one electrical issue that has got this chump stumped, and I need some wire identification help as well

First, the problem:

Ok, I have basically entirely rewired the truck top to bottom, but I've run into an issue that has got me majorly puzzled. On the fuse box, there are the orange wires that run into two terminals named BATT almost directly to the left of the blinker. When the truck is just sitting there, those two terminals only have .2 volts on them. If I hit the power lock button, the power lock relay clicks, and they bump up to .8 volts. However, I need 12 volts outta both of those terminals, and I cannot for the life of me figure out what is wrong. Does anyone have a diagram that can tell me whats up? I'm thinking of simply pulling the wires and putting a direct 12 volts from the distribution block on the firewall (though I suspect that is where they should be getting their power in the first place)

Second, 2 quick wire idents:

I basically need a couple of wires I need to find to finish off my TPI install, and my remote starter install. First thing I need is a wire that is only hot when you are cranking the engine. I need to know the color of the wire, and where I will find it. The next thing I need to know is which side of the park neutral switch I need to tap into -- The yellow wire or the purple wire?

[jermasaurus]

Originally Posted by Russell

Hey fellas!

Second, 2 quick wire idents:

First thing I need is a wire that is only hot when you are cranking the engine. I need to know the color of the wire, and where I will find it. The next thing I need to know is which side of the park neutral switch I need to tap into -- The yellow wire or the purple wire?

From the diagram in a Haynes manual, it shows the wire being purple for an auto trans. I think it is somewhere around the steering column, or it would end at the stater for sure. Hope this helps a little.
-Jeremy

[slingin mud]

what year truck

[Russell]

Its an 80 GMC

[slingin mud]

Chevrolet And GMC 1977 And 1980 C and K Model Fuse Blocks

(The numbers, eg; "UF2" Cargo Area Lamp, are RPO numbers.)



A - Fuse - Traffic Hazard


B - Fuse - Tail, Stop Courtesy Lamps


C - Receptacle - TP2 /M40


D - Fuse - Radio & TCS


F - Receptacle - C91/UF2 (Cargo Area Lamp)/U35/U37


G - Fuse - Heater / Air Cond.


H - Receptacle - C62


I - Fuse - Accessory


J - Fuse - Panel Lights
K - Receptacle - NL2/A33/U16 (Tachometer)


M - Receptacle - Accessory Lamps


N - Not Used


O - Fuse - Reversing Lamps


P - Fuse - Instrument Cluster Feed






1980


A - Choke
B - Fuse - Heater / Air Cond.
C - Receptacle - Accessory
D - Receptacle - Ignition ( key on power)
E - Fuse - Auxillary Heater / AC
F - Fuse - Instrument Cluster Feed (gauges)
H - Fuse - Tail Lights, Courtesy Lamps
I - Fuse - Wipers
J - Fuse - Horn
K - Receptacle - Power Accessories & other Accessories
L - Receptacle - Battery (constant power)
N - Not Used P - Fuse - Turn Signals, Reversing Lamps
R - Fuse - Fuse - Radio & TCS (Idle)
X - Receptacle - LOS
Z -Fuse - Stop (brake) Lights, Traffic Hazard Flashers

[Russell]

Ahh, that clears up the dome light issue, it is connected to one of the two ports which have no power... Receptable L has power, but K and one other one doesn't

[Russell]

Well, the truck's harness has some some sort of a deeper issue somewhere. I'll have to pull it all out and try to figure out whats going on with it. I have no dome or cab light, the park neutral switch doesn't appear to do anything, and the batt terminals still have no power. At least I can organize it a bit now, its rather messy compared to the TPI harness, which by the way, finally checked out perfectly The ECM communicates with my laptop, and all the sensors are looking perfect!

[Russell]

Two guesses what was wrong?

If you guessed a blown fuse, give yourself a pat on the back, LOL