HI Dave, according with you discription of the problem (by the way very good explained) look like you have a problem with the wiring conection in some parts or the batery is no good (you don't say if it is new).If the batery is good then start removing every conection and clean it well (w40 is a very good cleaner) dry proply and back assembly the conection. First with the cable from the point of the batery to the main switch with all parts in betewen, like the black box you say (that is probably a relay). After this is finish, or before if you like, check the earth cable, remove it from both ends, at the batery point and at the point where is conected to the engine, I think may be it, the earth cable is the main cause of the problem. Be pacient and do step by step and I'm sure you will resolve the problem. If still it is no enough to resolve the matter, and you consider I'm of value to help you to resolve the problem, do not exitate and send me a message and I will help you with real plessure.
Cheers Oscar
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