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The Norfolk Broads Forum / Broads Boat Owners Q & A / wiring diagram for 1972 bmc diesel
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Posted By Discussion Topic: wiring diagram for 1972 bmc diesel

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BtheGuy
Apr-07-2019 @ 12:49 PM                           Permalink
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Does anyone know where i can find a wiring diagram for my bmc 1500 diesel? I have repaired the alternator which is now charging again but want to check all the connections in the system as we found some loose ones when we removed the alternator for servicing.  My bmc manual does not have a wiring diagram with it.

BtheGuy

billmaxted
Apr-07-2019 @ 3:02 PM                           Permalink
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To be honest I don't think there ever was an official one.  There was a BMC instrument panel but that was by no means universally used and each Boat Installation tended to be unique even from the same yard and indeed even the same class  Frown

Bill...(The Ancient Mardler)

sadie
Apr-10-2019 @ 12:06 PM                           Permalink
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got a bmc 1500 engine manual not sure if there is a wiring diagram but will have a look this weekend John & Di

billmaxted
Apr-10-2019 @ 3:55 PM                           Permalink
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I was assuming that what our friend was really asking was what each of the terminations on a BMC engine were for rather than a wiring diagram for his boat's full installation.  Of the latter there is little chance of there being any.  The point I was making was that there are a number marinisations and many cases over the years a lot of those have been modified without any documentation so really it is a case of going back to the starting block and tracking things back to source.  You really need to find a yard which is still servicing BMC engines for their own fleet or other customers to help.

Bill...(The Ancient Mardler)

annville
Apr-10-2019 @ 6:05 PM                           Permalink
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Hi Guy As Bill said engines don't have wiring diagrams your bmc engine if it has lucas wiring colours the + pos on alternator is thick 50amp and is red or brown you could have two if high output alt, earth or - neg term is black the ign term is white and goes to ign warning lamp the W term is white/black and goes to rev counter you need to smear some vaseline on the terminals and wire ends before you crimp and push spade terminals back on alternator this will stop corrosion and high resistance.  boat builders have their own colour codes as they buy wire on drums normally red is live and  black is neg/earth plus all colours there after. John


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