ok stupid question here - the main positive lug on the back of the alternator what do you have on it - the two red wires with single lug with fuseable links in them usually go to it - I have however seen the color be black but usually they are red - off the back of the alternator on newer vehicles is the only place I remember fuseable links, In the 70s they ran down to the main positive lead on the starter - if I happen to remember right with chevys the only wires on the starter on newer vehicles is just the main positive lead off the battery and the usually purple in color wire for selonoid engagement - It's very early in the morning here and ol brain is gettin a little fuzzy but this might be a place for you to look into - EDIT - ok im kinda awake now and brains not as fuzzy - in most cases on chevys the main lug on the back of the alternator has one hot lead from usually the positive battery cable at the battery - then the two wires with fuseable links attach there also - the wires with links is where the body, fuse boxs ect. gets its power from - the wires with links should not have power intill hooked up to alternator - the red that you attached to the terminal strip might be back feeding power and if you don't have a hot wire on the alternator post maybe thats where you need to hook it up instead [ or not ] Have you traced the wires with links to see where they go ? hard to trouble shoot at a thousand miles away - better pictures instead of one with a wire sticking up would help

 

With the original length of the wire Im thinking the only possible place is the starter.I hooked 12 volts to that terminal and ground it turns my engine over but with the security system.Maybe hooked up directly to the start it wont do that.Im going to trim the these wires back down to the original length and hook up to the starter,I`ll see what happens..................

Now the red wire on the driverside has one of those 2 piece inline fuses about 6 inches long give or take the only place I can think of is the terminal box on the driverside fender.It has other red wires of the same guage connecting to it.I didn't get a chance to run a continuity test yesterday cause of the the weather and I just wasn't plaine feeling very good.I can hook it up where I think it goes if its wrong the worst thing is the fuse will blow.

 

Heres my .02 cents, that two wire fusible link with lug looks like it goes to the starter positive post, the harness that its coming out of may be in the wrong location, i can look at mine tonight and see how its routed but to me it looks like theres way too many harnesses right there. Heres a basic positive power diagram explained in words, on the + cable at the battery there should be 3 wires coming out, The large one goes to starter + post (sounds like you already have that), the second largest one goes to the alternator + Post (The alternator sends power back through this to re-charge the battery)(usually has black rubber sheild that that slides over the end and covers the connection), then there should also be a smaller gauge wire with a plug on it, this is + Battery power directly to the ECM. Then your "LOST" two wire fusible link terminal should also go to the starters battery + post which is essentially the same as a connection to the battery + terminal, that fusible link wire feeds power from the battery + cable to the rest of the vehicles electrical system, basically bring main + power into the fuse boxes.

As for the other wire connection near the firewall, i have no clue because i didnt really see which wire it was in the picture, but if the wire is factory and its red then it probably needs positive power.

Hope this helps, let us know you find.

Also just found in a wiring diagram there is wire labeled "Trailer Wiring Provision" thats connected to the Power Junction Block and the diagram showed an inline fuse, that may be your other wire?

 

I haven't seen the two wires with fuseable links ran back to the starter in years prob because of the clearance issues around exhaust and i didnt realize with yours there was enough length too reach that far and as dimeblazr said it will get power there as well - I seem to have a fleet of 6 vehicles and in that fleet for the moment I have 3 S10s a 1997 LS for sale, a 1984 work horse, and my 4x4 toy built out of a 1992 jimmy in my avatar and all 3 have the newer way of running the wires to the alternator -blazers are wonderfull vehicles but they all have quirks and after thoughts right out of the factory - take the 4.3s two plants built them and both built them just a little bit different and by doing that cranks, rods ect wont readlly interchange between the two so in my after thoughts who says chevy didn't put the wires back on the starter

 

I think the late 95- 96 jimmy was the only model that is wired differently from the other years of the Jimmys.I have looked at 97`s through the year 2000 all of them are wired differently.On 94 4.3 in chevey trucks the two wires with the fuseable link are connected to the battery.At this point Im thinking the only place these wires can go is the starter,I have seen similar wiring on other vehicles.It snowed last night and 2-3 inches fell.Its extremely cold right now so I wont be able to get to this beast for a couple of days.Like mentioned I can hook 12 volts directly to this wire and then a ground the engine will turn over and start running all the accessories.It wont reach the battery or altenator cause the length is too short.Give me a couple of days and I`ll try hooking this up to the starter when I can and see what happens.If somebody has a 96 and can lok at the wiring on their truck it can mostly help me figure out where these mystery wires go to.

 

Heres my wire scheme as of now,3 wires going to the positive side of the battery.
1ed wire going to the altenator and the plug connection.
The mystery wire today I shortened it back to its original length + a couple inches just to give me room to work with.
I have it routed to down to the positive side of solenoid on the starter.Tomorrow I will try and get to the starter and lower it so I can connect this mystery wire.
I also ran continuity test on the wire it only has power when the key is on.
The other red wire on the driverside I have nothing no power coming out of it so it must get power from the relay box on the side of the left fender,this what Im assuming anyways.
Like as mentioned before it has an inline glass fuse so if its hooked wrong its only go to blow the fuse which I also checked.It looks to be good no broken filliment inside of it.
Then theres an earth wire that was either accidently cut or broke that I soldered together since I ran out of inline wire splicers.
There are some diagrams earlier in this thread I think they are black and white if somebody can find me a color coded diagram that's the same it would help a lot.
@ dimeblazer did you get a chance to look at the wiring on your jimmy yet?If so is there a drawing or pic of what you seen?
Thanks Aaron

 

I also found this same wire in another thread this is the wire Im trying to figure where it goes.
https://blazerforum.com/forum/lighti...-wiring-66780/

 

Hey I tried hooking that wire up to the starter post on the back of the solenoid uh found out it doesn't go there either.As soon as that wire touched the post it turned on the fuel punp,lights and turned the engine over without the key in the ignition.
Anyone have any other help to add?

 

ah...that's supposed to be unplugged...it's the pump test connector. There are 2 or 3 single tab connectors for testing purposes. They are to be left unplugged and hanging.

I did find an image in reference to that back bar (#1 in pic)... I KNEW it was 12v power strip -somebody disagreed with me above. The image may or may not help you but I'll post it anyway.

 

Sorry the above image doesn't help me on my jimmy but the image shows how the wiring is exactly routed on my 94 gmc truck.Im going to try and get my hands on a chiltons book for the jimmys.