Deleted
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Post by Deleted on Sept 9, 2022 13:25:25 GMT
I'd put a cable on anyway. yes but to where. The battery? Yes. An earth lead just to take out any resistance caused by engine mounts etc.
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Post by kris on Sept 9, 2022 13:28:19 GMT
yes but to where. The battery? Yes. An earth lead just to take out any resistance caused by engine mounts etc. okay, I’ve never wired up an alternator from scratch before. Just replaced like for like where you just connect up the wires already there.
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Post by kris on Sept 9, 2022 13:36:58 GMT
Where does your starter motor get its negative connection from? The battery, okay. So I run two thick cables from alternator to battery positive and negative. Then one thin wire to the positive with a bulb in line. Does that sound right?
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Post by kris on Sept 9, 2022 13:49:28 GMT
Far to many words there. The other complication I might have is I don’t use an ignition switch on my main engine. I just run a thick positive and negative to the battery then have a push switch connected via thin cables to activate the solenoid. Oh well nearly there. I’ve got a feeling I need a key or at least a switch in the exciter cable.
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Post by kris on Sept 9, 2022 13:53:24 GMT
You don't need all the words, but there is valuable information further down the page (after the explanation on how alternators work) yes I’ve looked at that and will look again later.
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Post by Deleted on Sept 9, 2022 14:25:46 GMT
I see Tony Brooks is still active most days on the other side.
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Post by kris on Sept 9, 2022 14:27:55 GMT
So that article says Older boats may well have a rising oil pressure switch that sends this current to the rotor as the engine starts – especially if it has no ignition switch and a push button start. Sounds a bit complicated, I’m wondering if I can put a simple on off switch in the exciter cable?
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Post by kris on Sept 9, 2022 14:28:42 GMT
I see Tony Brooks is still active most days on the other side. I don’t go to the dark side.
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Post by Deleted on Sept 9, 2022 14:37:28 GMT
I see Tony Brooks is still active most days on the other side. I don’t go to the dark side. ...and there was me thinking we're the dark side!
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Post by kris on Sept 9, 2022 14:39:27 GMT
I don’t go to the dark side. ...and there was me thinking we're the dark side! No this is the sunny uplands of a forum.
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Post by Deleted on Sept 9, 2022 14:40:47 GMT
Does have the odd cloudy day every ... now and then 😁
Rog
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Post by kris on Sept 9, 2022 14:45:07 GMT
Does have the odd cloudy day every ... now and then 😁 Rog Yes there do seem to be a few of these at the min. But I suppose there is a lot of general unease in the air at the moment, which the queens death as just added to.
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Post by Telemachus on Sept 9, 2022 20:56:04 GMT
You need a -ve circuit path to battery negative, but most likely that is already extant because the starter motor negative is connected to engine casing, and most likely the alternator negative is also connected to its case so, via the mounting bolts etc, there is a connection. Only exception would be if it’s an insulated negative alternator, but that can be checked by measuring the resistance between B- and the case which should hopefully be zero.
You need a fat wire from B+ to battery positive VIA the battery isolator if you want to comply with BSS,
You need a fused and switched connection from battery +, via a warning light, to the D+ terminal.
That’s it.
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Post by kris on Sept 9, 2022 21:00:58 GMT
Thanks for the reply. How many amps for the fuse? Also would I start the engine then flick the switch or switch it on and hen start the engine?
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Post by Telemachus on Sept 9, 2022 21:07:47 GMT
Thanks for the reply. How many amps for the fuse? Also would I start the engine then flick the switch or switch it on and hen start the engine? Fuse just needs to cope with the warning light current, so a couple of amps unless you have a huge warning light! It doesn’t matter whether you flick the switch before or after. After is probably marginally better because the engine will already be up and running. The only thing to be aware of is that the switch/warning light, when turned on, will activate the alternator. But if the engine and alternator are already up and running, turning off the switch won’t turn off the alternator - nothing will happen.
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