Where is this leak coming from? (Photo)

[daddyfixit]

if you have disturbed the large grommet by shoving the power cable through it, perhaps the grommet is no longer attached to the hole in the bulkhead ??? I would leave a hose pipe running down to where the grommet is under the bonnet, while looking in the car with a decent torch for ingress. then poss take it out and refit, then water test again..........