1970 Ford F100 under hood mercury switch light?

[brans72]

Hoping someone here can help me out! Working on a 1970 Ford F100 truck, Someone has cut wire and trying to find where there wiring coming from the under hood mercury light goes to in the harness. I do know it is a power wire. Trying to get fixed asap for my boss and tried goggle with no luck. If you do find answer there please let me know how you searched it, so I can learn something new on ways to search. Thanks in advance guys! Brandon