Originally Posted by hillstrubl
Few things are as irritating as trying to find a consistent current draw
Try finding an inconsistent current draw.
In the scheme of things these older trucks are very simple and finding current draws is straightforward (especially on Defenders). Narrow it down to the circuit, then narrow down the components in the circuit.
I spent days tracking down a 100mA draw in a 2005 Range Rover. Things get much more complicated when you have data networks linking modules together that are on separate power circuits. And even more so when you have a bastardized model year with different electrical systems designed by different manufacturers linked together by a network that there is next to no technical information available for.
That one ended up being the radio head unit staying on, but because the gateway module had failed and was "telling" it to stay on.