I'm in the middle of my LTx swap and I'm trying to identify these connectors that come from C100, they are in the harness that goes behind the engine and connect to several things on the passenger side. I know some of them are not used any longer but what looks like fused power connectors probably need to be connected to something. Also the purple wire, is that the starter wire? This is what happens when I pull everything apart 6+ months ago and didn't pay too much attention.

 

First one looks like electric fan butt it's hard to be sure.

Yes purple goes to the starter (the "S" terminal specifically). The large ring terminal goes on the big post, underneath the end of the + batt cable.

The round connector and the wire with the mesh looking tape that's peeled back, go to the AC compressor. The one wire with the bare connector and yellow tape goes to the temp gauge sending unit.

The grey connector with the fat red wire, and the square one with it, plug into the AC system harness, near where it comes through the firewall right by the heater hose nipples.

The pink & white wire one goes to the ignition coil.

 

1st pic the one in your hand is alt. Depending how the LS alt is wired, this may not be used at all. If you need 12v ign to run a resistor wire, then the BRN wire from this connector can be used. If the new alt and harness have full computer control for the alt then the connector is removed entirely

The big cables all went to the started. PPL is starter solenoid. The big reds are all 12v batt for various parts. Fuseblock, headligtht switch, HVAC, fans etc. The large splices connect the fusible link to the main cables. Do a continuity test from the ring to the respective ends before installing that bundle. Fusible links are a pain to troubleshoot after the fact

2nd pic
Small round is AC high pressure switch at the rear of a R4 compressor. Will not be used unless you go back with a R4 compressor
Disintegrating tape connector goes to the AC compressor clutch. I'd ditch that and run a fresh wire to your new compressor
single wire with a crumbly connector was coolant sender for the gauge. Keep this wire and decide if you want to use the 98 3 wire CTS or drill/tap your PS CYL head for the old sender

3rd pic
LG pink wire was old coil. It's unfused 12v IGN. I never reused this wire with a LS swap
BLK 4 pin connector is HVAC inline. There's a mini-harness attached to the HVAC box that goes into the firewall. It plugs in there
GRY 1 pin, HVAC blower fan 12v batt. Should be right next to the HVAC plug on the box

In the future if you need help ID connectors, please list the wire color/size going into each next to each pic

 

Thanks for the help guys!

 

OK looks like I have a few more that I'm trying to figure out what they went to...


The first picture is at the back of the intake manifold, that harness I believe comes from C100. It has two ground wires going to a single eyelet, any idea what that circuit grounds? That's really the biggie because I don't have a good spot to ground it to without extending it and if it's no longer used than I will just get rid of them. Then there is also a 2 pin connector that I'm not sure what it used to go to?




2nd picture, single pin red wire female connector that comes from the positive battery terminal wire, just don't see anything that it plugs in to except maybe the electric fans?




3rd picture, single pin orange wire male connector that goes to the fuse container on the passenger side fender

 

Things that need to be grounded. Looks like the one that went to the back of the head. You need it. Ground it to the engine.

Looks like the infamous "mystery connector". Doesn't go to anything. Best guess is, since the wires are the 12V source to the ECM and ground, that it was used for testing the electrical system, before it was installed on an engine and before the engine was installed in a car; both probably at plants where the subassemblies were built.

The 2 things in your 2nd & 3rd pics plug into each other. That's the power to the ECM. No idea whether you need it in your swap, the new ECM might get its power some other way.

 

Yeah I know it was originally grounded to the engine but I'm pruning stuff out that I don't need and just need to figure out what circuit it's grounding. It may not even be in use at this point in time with the swap I'm doing.

Ahh interesting that's where the OEM PCM gets it's power from, definitely don't need it with my swap so it looks like another thing I can eliminate.