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The Norfolk Broads Forum / Broads Boat Owners Q & A / Follow-up: Engine Wiring - Seamaster 813/BMC 1.8
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Posted By Discussion Topic: Follow-up: Engine Wiring - Seamaster 813/BMC 1.8

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AndyH
Apr-18-2007 @ 4:59 PM                           Permalink
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I solved the charging problem that was the subject of my earlier post. Turned out to be a very straightforward but well hidden cause. The sense/field wire was fractured and separated from the crimp connection - even though the cable was securely held in place by the insulation of the crimp connector!

Was well chuffed to sort that out without parting with any money Playful

In my earlier posting I also asked about the panel of related electrical components mounted on the starboard side of the engine. I've now figured out most of this with one exception. There's a small cylindrical (slightly torpedo) shaped component (about 2.5in long and about 1in diameter) with three spade terminals. There no clue as to what it is and the only labelling I can see on the housing is "Do Not Drop" - helpful huh! I've tested between all three terminals with a multimeter and they all appear to be open-circuit. ANY IDEAS WHAT THIS COMPONENT IS PLEASE? The fact that I get an open-circuit reading suggests it's faulty but no obvious effect....

Finally, my appeal for a wiring diagram didn't get anywhere - not surprised. However, since solving the problem (in case it helps anyone else) it seems there's enough common information in the Thorneycroft 1500/2500 manual available at http://motoren.ath.cx/ - except it doesn't answer the question above Frown

billmaxted
Apr-18-2007 @ 5:28 PM                           Permalink
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Cor You ask the hard ones when you can't see what you are talking about, at a guess it sounds like a starter relay (with a square back plate?) it could have been bypassed and replaced by another perhaps hard mounted to the hull to avoid vibration.

Bill...

AndyH
Apr-18-2007 @ 9:05 PM                           Permalink
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No I don't think it's a relay - it's too light for one thing. The starter relay is mounted the other side of the alternator control unit.

Casper
Apr-19-2007 @ 8:20 AM                           Permalink
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Andy,

any chance of a photo of the article, we should be able to identify it for you then, someone on here will have one I am sure - and probably know what it is and does.

Alan

Alan & Gill

Antares_9
Apr-19-2007 @ 8:47 AM                           Permalink
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It may well still be a relay, some are very light and encased in an aluminium cylinder, not heavyweight enough for a starter but certainly enough for a bilge pump, stop solenoid or some domestic piece of kit long since removed. A previous owner may have wished to fit a lightweight switch or sensor that would not have carried the current required to operate it, or the resulting cable run may have caused a voltage drop that was unacceptable. Truth is , with old boats and disconnected bits you may never get to the bottom of it. If it is still connected you should be able to trace the cabling to the related components.

Meus stilus es pelagus testes

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Dr-Diesel
Apr-19-2007 @ 12:54 PM                           Permalink
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Andy,

I doubt it is a relay unless the casing is earthed. If it is not, it will have four terminals on it, an earth which connects to the internal coil, a switched live which also connects to the internal coil. It will then have a permanent live, which will normally be a heavier cable than the switched live (otherwise you are defeating the object). And finally you should have an equally heavy wire from the relay which goes to the component it controls.

It may be a control for the heater plugs but if you can send a picture it will clear it up.



Regards

Paul H

http://www.honeymob.co.uk

Antares_9
Apr-19-2007 @ 1:09 PM                           Permalink
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Being mounted on the side of the engine would be earth enough, unless I misunderstood the post.

"vertically mounted metal plate on the starboard side of the engine", no, it appears I didnt

Meus stilus es pelagus testes

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Life was sweet for a broads ships cat

This message was edited by Antares_9 on Apr-19-07 @ 12:13 PM

BroadAmbition
Apr-19-2007 @ 5:37 PM                           Permalink
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I reckon it's a flasher canister for the indicators!! Evil Grin

Sorry, Sorry,  Yes I know, I'm leaving via the back door head held low in shame  Blush   -  Griff

One of these decades we WILL finish Broad Ambition !!

Antares_9
Apr-19-2007 @ 7:40 PM                           Permalink
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It does sound a lot like one Ba, especially the "do not drop" ledgend, it can't be....... can it? Smile

Meus stilus es pelagus testes

Cat philosophy:
Life was sweet for a broads ships cat

AndyH
Jul-07-2008 @ 10:37 PM                           Permalink
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In reply to Dr Diesel on 19 April 2007 (or anyone else that knows)!

>> It may be a control for the heater plugs but if you can send a picture it will clear it up.

It was a very long time ago but happened to think of taking a picture whilst crawling around under the cockpit floor on Sunday...

The component in question is the one with a red ring around it. Any ideas?

Andy


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