any images of the battery connections main earth cable and the starter motor and alternator connections .have you checked the output voltage on the alternator main connection and then on the starter motor main connection and then the battery

AERIAL

on the rebuild was a discovery harness used for the engine connections utilizing the bulkhead plug etc and spliced into the original body harness or the whole vehicle TD5 harness used

have you adjusted the lumbar position to support your back

what year and when was the engine fitted as you say it's a 110 and not a td5 defender as this affects the wiring

worth a read

before condemning the battery and alternator as steve2286 said DVM. you could have loose or broken wire's to the alternator loose or badly corrode battery connector's ,badly corroded earth connection so look for corrosion on the cable crimps and signs of damage to cable's where they pass...

may help

is there not provision for front fog light that you can use behind the front bumper without baster sizing the console

a roof rack with a sheet of OSB will give you more room

if its a series 1 or 2 the original pin were 3BA ,was the old tank re-tapped at some time or ask the new tank supplier what thread size he used

as Datatek mentioned

when applied to plastic and rubber trim returns them to black ,require rubbing in an excess buffed off

have you tried try boiled linseed oil works great on the Freelander plastics

is this the item you are looking at https://www.johnrichardssurplus.co.uk/oil-cooler-filter-housing-water-outlet-thermostat-2-4-puma-lr005894.html