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The Norfolk Broads Forum / Broads Boat Owners Q & A / 1.5 bmc
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Posted By Discussion Topic: 1.5 bmc

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Jacktar74
Feb-12-2017 @ 9:40 PM                           Permalink
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Hi
can anyone help with a wiring diagram for a 1.5 bmc and also which alternator wire i connect to the tachometer


cheers

Dan

annville
Feb-13-2017 @ 12:41 PM                           Permalink
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Hi Dan What exactly do want to know the tachometer wire goes to the W terminal on rear of alternator if a Lucas one but could be Bosch or another make,please be more perceiveic. John

Pulse
Feb-13-2017 @ 2:31 PM                           Permalink
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Just make sure its not running an 11AC alternator as the wiring is completely different. Mine is also Positive Earth.

Picture is of my 11AC Positive Earth setup



This message was edited by Pulse on Feb-13-17 @ 1:32 PM


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Geoff15
Feb-13-2017 @ 5:35 PM                           Permalink
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hello Dan, Pulse has pretty much hit it on the head, check if your wired positive or negative earth & what alternator you have - take a pic & post on here if your not sure, rest of wiring is fairly straightforward, but depends on the above, regards Geoff

Geoff, Southwind26

LeoMagill
Feb-13-2017 @ 8:06 PM                           Permalink
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If your alternator doesn't have a W terminal you can usually delve a bit deeper and solder a phase tap to one of the poles before the diode pack, I've modded alternators for tacho pickup on my last boat.

If you don't like what I say don't hurl abuse at the boat, I've sold it...

Perfectlady9
Feb-13-2017 @ 8:17 PM                           Permalink
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Nipper has a BMC 1.5 so I have attached a wiring diagram of the engine installation .

Doug.

Now I know what Trigger meant
about his Broom !
The Moore the merrier.


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Lopez
Oct-24-2021 @ 10:48 PM                           Permalink
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Bringing this thread back from the ashes just to say thank you for posting that diagram Doug.

I found it incredibly useful as the wiring in my boat is an absolute mess and 50% of it is not even connected to anything  Wink



This message was edited by Lopez on Oct-24-21 @ 10:49 PM


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