I put the battery in the trunk a few years ago and I have a post under the hood the mount the power from the trunk,
and that leads power to the starter ,and also I have a 10 g wire from that post to the starter relay,
well after a few years the car started the other day and about a block away it us died and would start but would not run
I nursed it back home and started the diagnosis, first with the carb,replaced some gaskets and did a good cleaning and the I started on the electrical system and found the wire leading to the fan control module had gotten hot and the blade had melted out of the circuit board ,
so I started chasing the wire from the pos.post and had power there but no power from the post to the relay ,pulled the wire off and the wire was open, no nothing,
made up a new wire this time soldering the crimpers ,and then I checked the old wire it turns out the connectors failed and there was no power getting through,
The thing I learned here was to never assume the wire is good,and on wire that big it is important to solder the joints dont just crimp em they will over time loosen up and cause a night mare,
but it gave me some time under the hood since I really have not had to go under there since the V.P. trip the car has been super reliable for some time,