Can you please explain what you meant by your message bellow?
I have posted the problem I am having on the same thread -https://www.jaguarforums.com/forum/xj6-xj12-series-i-ii-iii-16/xj6-87-starting-problems-134673/

"mine had the same problem, very intermittent so hard to nail down, after replacing the starter all seemed fine for a few weeks then did it again, i read on here somewhere about there being a second terminal on the relay that is the same as teh one for the starter, i moved the wire to it and havent had a problem since!! going on 4 months now!!
the spare terminal is right next to the original one!

Good luck
__________________
Darren"

Darrenmb,
Can you tell me about installing the reading lights? I assume these are the period lights that are in the c-pillar trim? Thanks