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RedRover

Constant 12 volts live

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Hi,I wonder if anyone knows why i have constant 12 volts live switches even when battery isolator is switched off,i have an ex hire boat maybe it was there process.And could it be dangerous.?

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They may be connected direct to the battery or possibly even the permanently live side of the isolator switches or even a permanently live bus bar Barry, the only real need for this is essential safety kit like bilge pumps and Co2 / smoke detectors or possibly Eber / Webo type heaters to prevent them being switched off without going through a shut down cycle which would be a possible fire risk. All that said there is nothing intrinsically unsafe about it provided they are correctly fused as close to the batteries as possible.

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Hi Barry and Olive,

The only feeds that would normally be left live are for the bilge pump and those considered as essential (which could possibly include 12 volt supply to an Eberspacher or Webasto, enabling it to be started remotely or via an onboard timer).

Everything else should be completely isolated to prevent potential fire hazards.

In practice we are reluctant to leave the Eberspacher powered up, although it does have effective inbuilt safeguards.

Those jelly mould deckhead lights can sometimes be problematic and need to be isolated on a laid up boat.

We had one that would switch itself on without being touched, due to a faulty switch that would get hot first and then pass enough current to illuminate the lamp (a fire waiting to happen).

cheers,

Steve

p.s. just seen David's reply. (Deja Vu?)

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An unfortunate by product of diminshed velocity coupled with the appearance of the hitherto unforseen

(Unintentional Lakesailing)

Well you've lost me there steve. :?:?:?

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