There are usually only three high current wires that will give you trouble. The two amp meter wires and the ignition power. If you bypass those three you will likely be ok.
I disagree.
Only times I've seen the ammeter connections loosen is when the battery circuit has seen excessively high current. There's a very recent thread with such an example. :(
The connections that I've seen most problematic are bulkhead feeds for alternator, ignition, and battery.
Right up there, although irrelevant to the OP's engine power issue, are various headlight wire connections.