Originally Posted by awpptdt
I am putting a 100 amp GM alternator on my engine and I understand that the (#1) spade terminal must be switched. The question is do you switch it on just to excite the alternator or is it switched on the whole time the engine is running? Thanks. J.T.Duncan
You "understand" based on what?
Did this alternator not come with installation instructions? Are you not replacing an existing alternator?
Rather than ask for hit or miss advice on a web forum, I would follow the installation instructions or wire it the way the one you are replacing was wired.
If neither of these are appropriate, I would contact the manufacturer for wiring instructions.