So the whole you cut was 2-3/8" hole saw? Instead of 2-1/4?
Is that what you meant? I has run my harness, however it has this same rubber grommet and if I cut a hole it should fit right in it with no issues
Yeah, but upon further inspection? It's a tiz too big. Not a big deal, but 2 1/4 is what you need. I hacked a grommet for test fitting off a junker, and also drilled holes in scrap metal before I drilled. It is really 2 1/4.
You shouldn't need a temp controlled vacuum switch anymore, so you should be able to replace that with the thermal switch for the fan.
You can replace the 2 wire temp sender that you have for the ECM, with a 3 wire unit from a late '90s 3100 or 3400, that will have the same two wires for the ECM (Ground [black] and signal [yellow]), plus a third wire for the gauge (green). You will need to grab the connector for that CTS too. This connector is the same as the small round TPS connector. Using this sensor, should open up a spot for the thermal switch where the sender for the gauge would have normally been.
I would try to get the thermal fan control switch as close to the thermostat as possible.
There is a factory vac switch in the intake that has two hoses on it. Are you saying I can delete that? And thanks for the tip on the dual use sensor
. What was the one in the head? I can't remember what it actually is for.
Also, I think I am going to leave the rest of the harness stock. Off that relay, I only have to run that one wire back to the fuel pump? Is that right? Just looks like a mighty chintzy wire to supply enough current to run the pump to me.
Now I have another head scratcher. I wired up my VSS today, ran my CEL, which was easy as hell because there is already a place for it in the cluster. Just pulled a pin from another harness, followed the printed circuit soldered together with the pin from the ECM...and bam. I also finished the fuse box and connected the pink/blk and orange wires to the new isolated fuse box. The crank wire I still have to connect...no biggie. Off the ALDL I have a cut tan with a black stripe and nowhere for it to go. The schematics show some pretty weird stuff that I may not have on my truck. Schematic shows as TCC. I am assuming that is Torque Converter Clutch? Since I am using the existing stuff to control the shifting, I don't think I need this at all do I?
And the weirdest thing. I realize that the 86+ truck uses a different neutral/park switch than the older truck. What surprised me was that when I dropped the column? There was nothing connected. The black/orange wire was lying loose under the carpet, and the orange/black was hooked to an adapter on the fuse box (which fit). Now granted the last genius to work on this was me, and I had the truck in a zillion pieces. I had removed the cruise control on this truck, and I am kinda thinking this might be why it was connected this way? Anybody got a picture of a later column so I can see what I am supposed to have hooked up....and how? Better yet, does that ECM orange/black wire just need to see 12v? If it does, I don't really give a crap and I will bypass the switch. Thanks guys.
I would have NEVER gotten this done without your help. REALLY REALLY appreciate it!! MANY THANKS TO EVERYONE THAT HAS HELPED ME!!
Here is some pix.
These are the ones that come off the ALDL
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These are the two that are already on my truck. As said the black/orange one was laying loose, the orange/black one was on the fuse box, and the safety switch had nothing on it at all. Colors are washed out in pic, but the left one is orange/black, and the right one is black/orange.
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