It will not help a defective starter solenoid. It will help a flaky ign switch or NSS by letting the Ford solenoid take up the 8 amps of the starter solenoid, leaving the flaky ign sw or NSS to take up 1/2 amp of the Ford solenoid coil, which a flaky ign switch or NSS may be able to accomplish.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Is the Ford Solenoid only hooked/part of to the Skinny Wire that powers the Solenoid itself circuit?

How many amps does the Ford Type Solenoid pull?

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84 300D, 82 Volvo 244Gl Diesel

So far, with the current mild sunny Calif weather, my 300D has resumed normal operation.

So far I suspect the weird cold blast caused some problems combined with perhaps some other intermittent impediment in the starter which may have worked itself out now.

I pulled out a nice clean Bosch starter at the 'yard', just in case.

Bench tests fine.


afterthought, the long shot conspiracy theory might be that some coolant splashed on the alternator from a small seepage on the lower passenger side radiator. Coolant which accumulated at the base of rad and may have been picked up by air while driving. might have caused some interference with something although I did have the charging system tested prior to discovering the rad seepage and noted no residue on alternator.... dunno.....

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD