Hi, I have just fit a tow ball on my ford cargo it like most lorrys is 24v how can I reduce this down to 12v for towing a caravan or do I have to chang the caravan lights to 24v?

Richi, August 2009

hella make a devise for doing exactly this and it is available at good auto electrical parts distributors .
it is pretty straight forward to fit .

lecky, August 2009

(1) Take your supply from the positive of the first battery instead of across both batteries, thus giving you 12 V. You would of course need to install appropriate fuses somewhere along the trailer/towing circuit.
(2) Use a "potential divider" - put 24 V across two resistors of equal resistance which are in series. Make a connection between the two resistors - there will be 12 V across either one.
Bear in mind that unskilled people messing around with the electrical systems in trucks (adding accessories without fuse protection etc,etc) is the main cause of truck fires!

JD, August 2009

Put 24v bulbs in the caravan sockets - thats the easiest way!

John, August 2009