Join Date: Oct 2007
My Motorhome: Swift Kontiki 615
Thanked 823 Times in 736 Posts
Annoying 20 minute shut down of radio
I have at last, reached the limit of my patience with our motorhome radio....
I want to upgrade it to something with Bluetooth, aux input and such - none of which are on our current radio (the original).
I also want to stop the annoying 20 minute shut down after the ignition is switched off, but not by simply cutting the blue and yellow wire and joining the red permanent feed as there are numerous reports of problems with that.
The suggestion from a very old edition of Practical Motorhome is as follows;
THIS METHOD SHOULD NOT BE USED ON THE LATEST VERSION OF THE BOXER OR DUCATO
To simply eliminate the 20 minute cutoff but retain the ignition on switching feed is quite simple. You need a couple of feet of twin core wire (speaker wire is ideal as the current carried is very low) a diode and a switch. mount the switch in a convenient place and connect one of each of the two cores to either side of the switch. Remove the radio and with a multi meter or test lamp establish which wires are the permanent live and ignition switched feeds.
On Fiats the permanent live should be the thick red wire, the ignition switched feed is a thin yellow/blue wire. Once you have established the ignition switched feed cut it through about 50 mm from the socket and insert the diode into it (check it's the right way round by switching the ignition on, if the radio comes on then it's the right way round, if not reverse the diode).
Connect one of the two cores from your new switch to the permanent live and the other to the radio side of the diode. Now your radio will still switch on and off with the ignition but by operating the switch you can have it on for as long as you like without the ignition on.
To power your radio from the leisure battery run a new wire from your leisure battery (with a 10 Amp fuse as near to the battery as is possible) and cut the red from the original feed (again about 50mm from the socket). Connect the new wire to the red tail to the radio socket.
DO NOT USE INSULATION DISPLACEMENT CONNECTORS (SCOTCHLOCKS) FOR ANY OF THE CONNECTIONS. EITHER SOLDER AND INSULATE OR USE PROPER CRIMP TERMINALS AND CONNECTORS.
Parts needed (all from Maplins)
Diode Maplins Part number N72CA
Bell cable length to suite wher you are fitting the extra switch
Switch Maplins Part number NOOAR
10amp power wire and in line fuse for the leisure battery wiring (from local Car Accesories shop)
Thanks to Dave Newell for publishing the article in Practical Motorhome Magazine
But, of course, Maplins no longer exist, or if they do they don't sell components with that number (the diode), and I am out of my comfort zone knowing the characteristics needed for such a diode....
So, can anyone give me advice as to what size/quality/type of diode I need to find, and, any links for such a supplier would be gratefully received.
Thanks in anticipation.
Any typo that I make means the errorists win.
Any comments above are only MY OPINION
and should be read as that.