Thread: Rotronics MH10 Dual battery Isolator

Hi,
from memory, the thin blue wire is the power source for the 'blue box' itself, so is powered from the positive lead of the cranking battery.

I've only installed one, and that was probably over 15 years ago, so perhaps wait for confirmation.

cheers

bin it, get something better with comprehensive instructions and support from drivesafe.

(on most of the units Ive installed the thin wire that isnt black, red or yellow goes to an unswitched +12v)

Originally Posted by Blknight.aus

bin it, get something better with comprehensive instructions and support from drivesafe.

(on most of the units Ive installed the thin wire that isnt black, red or yellow goes to an unswitched +12v)

Ha ha. Just binning it may be a little drastic. If I had enough money to just bin things like that I probably wouldn't be driving a 2004 disco.

Now back to that blue wire, I really can't see how it can be anything other than switched/ign 12v. It only has 2 wires other than the heavy duty main and aux. They are black and blue and not heavy duty.

Cheers

Dave

Sent from my Motorola RAZR XT925

MH10 Diagrams 4wd Page 2

Originally Posted by Hastykiwi

MH10 Diagrams 4wd Page 2

Thanks hasty just as I thought.
Sent from my Motorola RAZR XT925

Not sure if this helps with your Rotronics, but my Matson simple isolator only appears to have two heavy red leads running to each of the batteries and a black lead running to an earth. Can't get at the bottom of it without removing the battery to check if there are any other leads coming out of the bottom and I forget, as its been in a while. An earth would normally be black, wouldn't it? Does the power go directly to your isolator, or to the main battery? I'm not an auto electrician, so sorry if this is a bit confused...

Sent from my GT-P5210 using AULRO mobile app

Originally Posted by davrac

Ha ha. Just binning it may be a little drastic. If I had enough money to just bin things like that I probably wouldn't be driving a 2004 disco.

Now back to that blue wire, I really can't see how it can be anything other than switched/ign 12v. It only has 2 wires other than the heavy duty main and aux. They are black and blue and not heavy duty.

Cheers

Dave

Sent from my Motorola RAZR XT925

depends on the setup of the unit... usually red and yellow are used for a switched power supply and other colours are used for hot feeds or power that is switched by the unit itself.

If the unit is essentially a dumb as a post relay type box that works on ignition switching alone then you dont normally have the additional wiring. (this is what I routinely set up)

if its a brainy box then usually there will be the main power feed cables, and voltage sensing wires as well as a manual operation wire that lets you bypass the lot.

then most of them will have an independent earthing wire which is almost always black.