Ωhm

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.

If the DRL module wire used for LAMPS OFF with PARK BRAKE being applied is looking for a path to ground, then using the grey/black wire at the proportioning valve will work for you. NOTE: Path to ground will also be made when proportioning valve has been shifted (brake issues) or when IGN SW is in the CRANK position (bulb check).

4_0L Engine Harness pg90.pdf Between C100_B6 and C103_E runs a YELLOW (14awg) wire. This wire should be IGN SW I1 feed.

Yes Battery Terminal with all Fusible links. No I don't. Something with gauge size.

Is this C102_6? If it is, then C102_6 uses Fusible Link H (Hot at all times).

I'm pretty sure that will only test to the check valve, not the reservoir.

Truthfully, I was only talking about how the CC Clutch SW would vent the SERVO, no more than that. But now that you mention it, make sure your CC Clutch SW is adjusted properly. I would think once the CC Clutch SW is engaged that would totally shut down CC and CC would have to be SET again. Try your jumper wire idea.

Now, I'm going to make a guess here, but I'll bet when the CC Clutch SW (Manual Trans only) is depressed and only the CC Clutch SW, this will vent the SERVO.

Yes. 88ElectricalManual pg48.

4.0L Option:

Looks like the SERVO has an internal vent, controlled by the Vent Valve Solenoid. Drawing shows valve venting to atmosphere. Could be the default setting (CC OFF).

cruise control system.pdf

Do a SEARCH using REM. See what others think about it. I like to think its a must have tool, especially for drivability problems.

Yes, also goes to the Wipers.

Check Ignition Switch.

@schardein Thanks for the follow up.

Check cavity C118_8. (PNK W/TR)

Ford - First on race day