sorry to bump this old thrad up but im thinking of doing the same and came across this in a may 2001 copy of land rover owner
on both 12-volt and 24-volt ignition systems the spark plugs operate with the same voltage the only difference is that the so called 24-volt plug has the sheilding to stop interference on the radios when used in military applications. so to convert theignition you will need a standard distributor,ht leads,normal spark plugs,and a spade connector
first remove the cable that runs from the droppe to the coil at the coil endand strip back the outer casing to reveal the wire inside then fit a spade connector to it
now removethe coil,spark plugs,ht leads and the distributor[making notes of the timing marks]now replace these with the standard land rover items and connect as normal
the cable on whitch you have fitted the spade connector should be fitted to the positive side of the coil once you have done this you can fit the standard electronic ignition system of your choice in accordance with the manufacturers instructions
the volt dropper is fitted tothe rocker cover its the little black box with the vents in
thanks to mark finch who wrote this
hope this helps goldie
