I tee a wire from the solenoid hot & dead end it near the power steering reservoir with an insulated solderless terminal. This allows me by myself to crank the engine w/ a simple pushbutton. Makes it easy to check for spark/injector signal etc. Just pack the terminal w/ grease to make sure it doesn't corrode.

Cool move. Guess this is just one more feature of the 240 that didn't make it into its "replacement".

Actually, the "Service Socket" is there on the 700/900 too, at least on my '93 940. It's not up on the firewall like the 240's, but comes from a harness bundle on the left front fender next to the air filter box.

It may not be easy to see (not much slack) but it's a single pink wire in a double Blue plug, with a female flat terminal.

So "ibs" had a good idea, even though Volvo had it first.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Bruce,

I'm sure I'm showing my ignorance, but presuming I found this socket on my 740s, exactly what would I need to make use of it?

Thanks
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Andy in St. Paul - '91 745 227K mi, '91 745 210K, '90 744 194K, all Rex-Regina; '86 745 GLE M46 230K; past 240s

Hi Andy,

I guess it's not well known, but can be handy for crankingthe engine over from under the hood—like for compression testing.

Just jumper +12V from the battery, preferably via a push-button switch, to the service socket. It goes to the solenoid ignition switch terminal, but not directly — the neutral safety switch (auto tranny) is still in the circuit.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.