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The Norfolk Broads Forum / Broads Boat Owners Q & A / Horizon/bmc cockpit wiring diagram?
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Posted By Discussion Topic: Horizon/bmc cockpit wiring diagram?

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Lopez
Oct-25-2021 @ 7:20 PM                           Permalink
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Haha. Yes, ultimately that's what I'm doing. But before I rio everything out I got to reverse engineer what is connected btonwhat and how...

Lopez
Oct-25-2021 @ 7:22 PM                           Permalink
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Stingers yeah. Loads of wires disconnected, afew that untraced to the engine aren't connected there either or straight up chewed up or cut, also the alternator is disconnected and the engine won't start as of today... I can hear a solenoid clicking in the background. Haha

Lopez
Oct-25-2021 @ 8:03 PM                           Permalink
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Ok so I'll carry on working out things then. Now for the stupid question, can someone point out what the switches/lightabdi or are supposed to do? That would help me out work out what should be connected btonwhat and test for voltage/resistance/etc.

Fwiw, when turning key to position 3 the top centre red light lights up, so I guess it's glowplugs? And when going into 4 to start the bottom red light lights up.

I'm getting a solenoid clicking of sorts in both positions 3 and 4

Thanks


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L'sBelles
Oct-25-2021 @ 10:26 PM                           Permalink
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I can't see your ignition switch in the photo but I am guessing it is one of the Lucas types with 4 positions. The basic function is shown in the attached.
Position 1 - All off.
Position 2 - Run. So all ignition switched feeds are live in this position.
Position 3 - Glow plug pre heat. Glow plug light illuminated.
Position 4 - Start. Glow plugs remain live and starter solenoid is activated.

Without seeing your actual switch terminals it is difficult to be more specific as there are so many different types. It might even be a Land Rover switch.

The clicking you hear in 3 and 4 may be a relay switching on the glow plugs but you should have a heavier sounding click in position 4 of the starter solenoid. It could be a connection issue or the solenoid itself. Check to see if it is the type with the manual plunger to rule out the high current side.

You will also have a warning light connected to the alternator which should come on in the run position but go out once the alternator starts charging.

As for the rest who knows? I'm afraid it is a case of reverse engineering the wiring to see where that leads you as it is almost certainly not original and has had decades of modifications carried out by people of varying competence.



This message was edited by L'sBelles on Oct-25-21 @ 10:35 PM


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PCL023
Oct-25-2021 @ 11:30 PM                           Permalink
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In position 2, ignition on, if two of the lamps light up, it’s likely your charging system has two alternators installed, one for the engine battery the other for the domestic battery/s. These should go out once the engine is running after applying some revs. Another lamp could be glow plugs, engine temperature warning or low to no oil pressure. The only way is to trace them back to origin. Using a multimeter can help here, for a no power continuity test, as I see there was at least one wire that started off as a brown wire and changes to yellow in the original photo.

Cheers

Paul





This message was edited by PCL023 on Oct-25-21 @ 11:31 PM

Lopez
Oct-26-2021 @ 9:17 AM                           Permalink
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Ok thanks everyone. Seems i got right the ignition at least, and L'sBelles, you were right that i got the Lucas ignition 'switch'. Had come across the same connection diagram you posted and found it useful. Thanks for digging it out.

Heading back to the boat to carry on guessing what's what. Oh the joys .

annville
Oct-26-2021 @ 11:25 AM                           Permalink
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Hi All as Lasbelles said plus 2nd position is also oil light charging light, if you are getting a clicking sound its because you have corroded/loose connections you should only get one click as solenoid activates to switch larger currant ie heater plugs ,starter motor most gauges will have s,+ this pos side with e,- is earth side or it is wired to sender as in oil warning lamp sender/temp sender, or in the case of ign warning light goes to ign term on alternator or where thinnest wire is connected, the W term on alternator goes to rev counter. John



This message was edited by annville on Oct-26-21 @ 11:31 AM

Lopez
Oct-26-2021 @ 12:32 PM                           Permalink
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Hi Annville. I got 2 relays So i get 2 clicks. So far I've worked out 1 relay does the starter and the other opens the circuit between the alternator and the batteries.

Found a pretty useful wiring diagram for the starter and looking at it the live wire from the ignition to the starter is not connected, so that may be why the nonstarter. Looking for the wire as we speak.

Thanks for the tips regarding gauges, etc. Btw

Diagram for future reference as someone might find it useful is here https://www.canalworld.net/forums/uploads/monthly_2020_09/image.png.6b520222131f10f18fd8a5ca0f6906db.png

And his website is full of really useful stuff so I'll promote him a little http://www.tb-training.co.uk/cover.html

Lopez
Oct-26-2021 @ 12:53 PM                           Permalink
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Ok, that was it. Engine is now happily purring along.

Weird thing, the starter/ignition wire was actually connected to the alternator, so on the one hand I was wrong about the relay, and in the other, anyone got a wiring diagram for the alternator? Haha  LOL

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