Decided to just go for it and replace all the glow plugs after some hard starting, who knows how long the others had been in there, (just got this SD), All went pretty good, also cut back some of that black cover over the wires and a bunch of stagnant water flowed out, starts great now, but as a plus my cruise control suddenly works perfectly! It's like the car felt like doing something nice for me back

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So far...'76 240 D (sold)
'84 300SD (sold)
'85 300D (sold)
'83 300SD (p.o.s. waiting on tranny swap)
'82 300SD (could be the keeper)

If the cruise goes out again, check for a broken or shorted wire along the engine harness.

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ASE Master Mechanic
https://whunter.carrd.co/

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/