Starter solenoid types and differences

Hi…someone know whats is diference between those 2 starter selenoide or whats mean…

1._ strater with no -push botom

2._ starter with push botom…

Mk2’s had the push button kind !

Either one is suitable. The push button type is an original style used for decades and if available, are usually more expensive, but look much better in a classic car than the later reproductions like the one shown. The advantage of the button is that it allows you to operate the solenoid manually, to ‘nudge’ the engine in little steps when doing maintenance or tuning. A very useful feature.

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As long as the transmission is not in gear :face_with_open_eyes_and_hand_over_mouth:

And ignition off (unless you want to remotely start it).

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Ok…thanks to everyone…

A bit off topic, but under what circumstances is this device called a solenoid rather than a relay? In plain language, solenoid refers to an electromagnet that actuates something mechanically (like the solenoid attached to the starter motor, which engages the starter to the flywheel). Or a solenoid that turns on the water supplying your washing machine, In the same plain language, a solenoid whose movement exclusively closes or opens electrical contacts is called a relay.

My Series 1 XJ6 has a starter relay (to which I often attach a push button; wish it came with one) which in turn activates a starter solenoid attached to the starter motor. I know that calling this relay a solenoid is common practice generally, but why? choose!!!:smiley:

The solenoid on the pre engaged starters acts as a relay, the bendix starters have a remote relay, and either are themselves supplied by the actual starter relay: it’s just easier to refer to the big switch as the solenoid? Then there’s no confusion between the 6RA and the ‚solenoid‘ even though it’s not really the right definition.

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Thanks David. Makes perfect sense.

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It is a solenoid. When activated from the starter button or key, the solenoid thumps the contactor bridge to close the high current circuit to the starter.

It is interesting too, that replacement rubber buttons are available from some specialist suppliers.

From Merriam-Webster:

: a coil of wire usually in cylindrical form that when carrying a current acts like a magnet so that a movable core is drawn into the coil when a current flows and that is used especially as a switch or control for a mechanical device (such as a valve)

So a solenoid has a core that gets drawn into the coil. Relays are generally not constructed that way.