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Depends on type of starter motor, some have a bendix some are pre engage.
If bendix the shaft may need lubricating to allow the dog to move.
If pre engage type, check for a faulty solenoid.
While I lack specific land cruiser knowledge, the starter relay is usually part of the solenoid that sits on top (usually) of the starter motor on modern cars. The job of this solenoid is to slide the starter bendix gear into engagement with the flywheel and apply power to the starter motor, turning the flywheel and starting the engine. The current requirements of the solenoid are modest, compared with the starter, and I doubt a relay is required to engage the solenoid. This solenoid is actually the starter relay, as well as bendix engager.
If you can trace the large power lead from the starter motor back to the battery and you find no relay inline, then you do not have one.
If the starter turns but not the engine several things could be going on. The most likely is the Bendix mechanism in the starter. The Bendix spins out and engages the flywheel when the starter turns and then a spring pulls the mechanism back to disengage. If it is inoperable you will get the symptoms you describe. Another possibility (and more likely) is a bad ground for the starter so that it does not get enough amps to spin fast enough to engage the Bendix. You can everything correct electrically and the ground will get you. I would have an electrical shop look at it.
What? If the starter motor is turning over but not engaging the engine, You have a bad Bendix drive in the starter. Be more clear on what problem you are having.
First check motor mounts...be sure no movement when turning steering wheel...the starter has a bendix that is spring loaded to engage, and dis-engage...this could be worn out and require a new starter...older cars sometimes used shims to set the necessary gap between the starter and flywheel...Hope this helps.
Starter drive (bendix) is bad. Starter drive is spring loaded and when cold sometimes hangs up or spring goes bad. 2 options - remove starter, disassemble and install new starter drive or just buy rebuilt start (has new drive in)
Check the connection at the starter relay. The battery cable should run to the relay and another runs from the starter relay to the starter. If the connection seems fine, the relay itself may have a crack within., preventing a starting connection. If this isn't the problem, the starter solenoid may be getting to hot and not engaging the starter bendix.
The most common cause of a "No Crank" condition is a bad starter solenoid. The starter solenoid is a large coil that, most often, sits on top of the starter and engages the Bendix drive with the flywheel and sends power to the starter. If the internal coil goes bad, the solenoid won't engage the Bendix or turn the starter on. This condition will not cause any noticeable noise other than the clicking.
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