Triumph Repair: Starter Solenoid Circuit GT6 Mk3, starter solenoid, brown wires

Question
Since the basic circuitry is the same as SPitfire,here is my dilemna.
Car was running fine, all circuits OK.
Parked and disconnected the battery, but after about 4 weeks when battery reconnected, no power to anything let alone the starter.
I have been up and down the circuit with tester, similar to your response on Spitfire. Circuits exist where they should, and not where they shouldn't.  Earth is fine, battrey is well charged.
Since I don't have lights, etc I am thinking that the new starter solenoid has failed internally, as that is the point at which battery power "spreads" to other circuits.
Am I on the right track?

Answer
Hi Phil,

Sorry, you are not on the right track. The starter solenoid can totally fail and all electric to everything on the car would still operate except the starter itself. Because the power to everything on the car comes from the one post on the solenoid that has the battery cable. The solenoid itself could fall apart leaving just that one stud with a nut on it that has the battery cable and all the brown wires on it and the rest of the solenoid can fall off the car as long that stud keeps the battery cable connected to all the brown wires.

It sounds to me like your brown wires are not connected to the battery cable at the solenoid. The solenoid itself has nothing to do with the connection of the car's power other then just to clamp the battery cable to all the brown wires.

Howard