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Check the Fuel Pressure Regulator (FPR) vacuum hose between the FPR and intake manifold for fuel in the hose.

Sound like this jeep ain't running at all. What are your symptoms? NO CRANK CRANK NO START START WON'T STAY RUNNING etc, etc.

Don't know here, just what the 88ElectManual calls it. This is different, but we don't know the reason for it. Correct? Does your 1990 Engine Control Harness have connectors C103, C104 & C109? Is that the reason for the Engine Harness request?

That is the correct symptom for this: Bad Thing.

Taken from 88FSM.

Make sure NO fuel is coming out of this vent hole used for the Fuel Pressure Regulator.

I'm not sure which way to go here, but this guy made me think about this.

I would think that the single connect is both the inlet and outlet, no check valve. With the double connect, one inlet and one outlet, that should have an internal check valve.

@cruiser54 Do you remember if that was that the CC side or the HVAC side of that vacuum reservoir you cut off? I'm wondering if both sides have the check valve.

We should learn from it, but instead we ban/burn the books.

Couple of more Eagles from the eighties.

You can always get more money, but a 2.5L injector NOS, now that's a different story.

"X" means cut the wire. Relay is as follows:

You'll need to fix/solve this first. I think when they bypass the Blower Switch, only the HI circuit is bypassed. Proof the following, should do the job. If you want M2 circuit relayed, do it the same way.

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If it a factory wire and if it could have been VIO/YEL at one time, it the Blower Motor Feed for the AC or Heater control unit.

2023 Memorial Day Parade. Best I could do is the belly side only.

That going to tidy up and look real nice when your finished.

Sorry I wasn't paying attention. I was thinking of the HEADLIGHT HARNESS UPGRADE and you were using that wire to power up the RELAYs. oops. Never mind.

Once again, bummer on that fusible link eyelet with more than one wire. DC Current pickup probe ($$$) would be the only way to solve this. FYI. Your now running Headlight current (Hi/Lo) through the IGN SW (C268_B3 - C267_I1).

Power Distribution 4L pg8.pdf

All fusible links go to the starter relay terminal. Yes. Not sure here but some say two fusible links go to one (1) eyelet. Could cause a problem, if true for Link J. I would say your factory protected.

If you can determine which RED wire goes to C100_D, use that. Fusible Link J would have gone to the headlamp SW anyways for power to the headlamps. Thats the wire your relays would bypass at the headlamp SW.

Clip that test light to the battery positive side and now you can check your ground circuits.