Using Multimeter to rest for 12v power at electric bed control. (1 Viewer)

[namwaldog]

On our 2010 Burstner, the island bed is able to slide back and the head tilt up using a 12v powered linear actuator.

This is controlled by a hand switch

And the two are connected to a control box..

The two black cables from the linear actuator and the hand switch both push into the right hand side of the control box.

The 2x red and 2x black cables, presumably supply power to the control box via the white plug on the left hand side?
Following these 4 cables back towards the power source, I find that the two red are marked 'Logic+" and" motor+" and are then crimped together to the brown wire of a twin flexible white sheathed cable abt the size of a 2.5mm domestic flexible power cable.
The two black cables are crimped to the blue cable of the same twin sheathed power cable. Sorry I can't get a good photo of this so I've made a scribble!

There are markings on the black cable but I cannot make them out.
I am trying to establish, using a multimeter, if there is power at the plug that goes into the control panel, as the switch has stopped operating the bed.

If there is no power to the plug, I shall have to find where the sheathed twin cable originates and check the fuse?

So, after the above ramble, can anyone advise how to test for power using the multimeter?

Thanks,
Barry

 

[Richard n Ann]

Set the multimeter to either 20v DC scale or just DC volts if it's Autoranging.
The blacks will probably be chassis grounds, so black meter lead to them

 

[namwaldog]

Sorted the problem this morning.....

Tested white plug and found to have no power! Impossible to physically trace the power cable so started at the other end.

Most of the 12v power on the habitation side comes from the Schaudt Electroblok 99 fitted in the MH.

Started going through the 12v systems methodically that are fitted..

Heating working,
Fridge working,
Lights working,
Water pump working,
Step working,
Solar working,

What else uses 12v on habitation side?

HELLA Power sockets NOT WORKING

What were the HELLA sockets fitted for? TV!

Check the Electrablok and there is a 10a blade fuse dedicated to the TV...

Close up of blade fuses...

Checked the red 10a blade fuse... BLOWN.

Replaced with new blade fuse. BED SWITCH WORKS.

Cause?
Last used TV about a fortnight ago. Bed switch has worked fine since then until yesterday morning. I have lubricated the bed sliding and folding mechanism in case that was making the actuator work too hard?

New supply of 10a blade fuses stached handy, just in case!

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[MisterB]

Sorted the problem this morning.....

Tested white plug and found to have no power! Impossible to physically trace the power cable so started at the other end.

Most of the 12v power on the habitation side comes from the Schaudt Electroblok 99 fitted in the MH.

Started going through the 12v systems methodically that are fitted..

Heating working,
Fridge working,
Lights working,
Water pump working,
Step working,
Solar working,

What else uses 12v on habitation side?

HELLA Power sockets NOT WORKING

What were the HELLA sockets fitted for? TV!

Check the Electrablok and there is a 10a blade fuse dedicated to the TV...

View attachment 677042

Close up of blade fuses...
View attachment 677046

Checked the red 10a blade fuse... BLOWN.

Replaced with new blade fuse. BED SWITCH WORKS.

Cause?
Last used TV about a fortnight ago. Bed switch has worked fine since then until yesterday morning. I have lubricated the bed sliding and folding mechanism in case that was making the actuator work too hard?

New supply of 10a blade fuses stached handy, just in case!

Great that you've posted the answer to your problem. Sometimes people forget to post the answer/solution even if they have resolved the problem simply ...