Inst LP is to protect the trans. You can bypass the trans to deliver "12v" and not blown that fuse.
If 5a fuse was obviously blown.... You have to look at all bulbs and sockets first.
Example: dash sockets can break metal part that could get loose and short out the dash "board."
If can't find it that way then maybe a wire problem like wire hit sharp metal and cut thru insulation. short finder might help if still blows fuses... example:
https://www.amazon.com/Tool...ester/dp/B000RFLR0U/Besides dash bulbs, dimmer controls lights for cig lighter, heat/ac head, at shifter, maybe ashtrays, aux inst pod in GT, maybe a few others.
ETA-->radio light and chime unit. Dimmer off then Chime won't ding for HL lights.
If any fuse breaks then can be just old age.
Fuses get heat cycles causing stress in metal and can break.
If someone adds more load like using bright dash bulbs and/or adds more normal bulbs... Might not push 5a but extra load just speeds up this issue.
Most People don't know Fuses are Very low value Resisters and get heated a bit in normal use.
Then add cabin temps reach 160-200°F to lowest Temp in winter.
Just Heat/cold over 30+ years can stress any Electrical part. Car power isn't very stable either causing stress in E parts too.
[This message has been edited by theogre (edited 02-02-2020).]