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EarlyBay Forums
Technical
Slow cranking when hot - any advice please?
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<blockquote data-quote="starbiscuit" data-source="post: 556136" data-attributes="member: 18416"><p>I have renewed the gearbox earth strap, the battery lead to the starter and the battery earth.</p><p>The problem existed before and is the same after.</p><p></p><p>I read a lot about hot start relay and I understand about voltage drop from the battery up to the ignition switch and back through the "crank" wire to the starter, leaving too little voltage to operate it.</p><p></p><p>But this isn't the feed that spins the starter motor, it only engages the solenoid (which throws the starter pinion into mesh and <em>energises </em>the starter)</p><p></p><p>So I don't see how a hot start relay would make the starter spin faster, because it doesn't directly feed the starter motor itself.</p><p>How does the voltage on the solenoid affect the current to the starter windings?</p><p></p><p>I do understand that it can make a difference if the solenoid won't engage at all, and that it is a good idea to take the load off the ignition switch contacts, which should make them last longer.</p><p></p><p>Maybe I'll fit a hot-start relay anyway and see what happens. 40A relays are only a few quid.</p></blockquote><p></p>
[QUOTE="starbiscuit, post: 556136, member: 18416"] I have renewed the gearbox earth strap, the battery lead to the starter and the battery earth. The problem existed before and is the same after. I read a lot about hot start relay and I understand about voltage drop from the battery up to the ignition switch and back through the "crank" wire to the starter, leaving too little voltage to operate it. But this isn't the feed that spins the starter motor, it only engages the solenoid (which throws the starter pinion into mesh and [i]energises [/i]the starter) So I don't see how a hot start relay would make the starter spin faster, because it doesn't directly feed the starter motor itself. How does the voltage on the solenoid affect the current to the starter windings? I do understand that it can make a difference if the solenoid won't engage at all, and that it is a good idea to take the load off the ignition switch contacts, which should make them last longer. Maybe I'll fit a hot-start relay anyway and see what happens. 40A relays are only a few quid. [/QUOTE]
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Slow cranking when hot - any advice please?
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