6v electrical wizard help needed. (Starter issue)

[NAES]

Helping my buddy on his '58 Westy. Very original with a 6v system and minimal hackery to the wiring.

The problem is the starter not engaging intermittently.

Ignition was removed and sprayed down with contact cleaner. Terminal function verified with a test light and power applied.

Power to the 6v starter relay verified.
Ignition switch power to the relay verified.
Relay clicks when power is applied.
Power verified at starter solenoid when ignition switch is activated.
6v power at the back of starter motor verified.
Screwdriver will jump both starter motor and solenoid to sterter motor. Both sound good with no hesitation.

Battery terminals cleaned.
Battery ground cleaned
Trans strap grounds cleaned
Starter connections cleaned.
Ignition switch screw terminals cleaned.

We're still having an intermittant issue with the switch engaging the starter solenoid. My guess is the starter solenoid is the problem even though it will engage every time with a screwdriver jump.

Are we missing anything? I've exhausted all the things I can think of. Before we swap solenoids or starters is there anything you guys can come up with. I'd hate to have hime throw $130 bucks at the problem with no change.

Thanks everyone, NAES
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Barndoor Mafia
Box On Wheels
SBS #00

[tasb]

Remove and clean the inside of the ignition switch with electrical contact cleaner. Remove the starter and shine up the mating surfaces on the starter and the bell housing. These are things I need to do to my 1957 Kombi after each winters storage. The switch is 69 years old and the wiring gains resistance with age.

You might also consider tinning the ignition switch wire ends.
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Roads Scholar
1957 Kombi low mileage 36 hp governor equipped M 178 Slow Drag Winner 2014, 2015, 2018

1965 hardtop Deluxe Microbus owned since 1990 M 620 factory 12 v 1500cc

1961 (October)Single Cab- Road Trip Workhorse

Member# 2059

[sub-hatchtim]

Og harness maybe full of corrosion

Try adding a hard start relay
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58' pg/sg silo fridge westy
58 Dove blue singlecab
76 911S