Looking for knowledge, I came upon this slightly dusty thread and thought I'd add to it. Just for a data point, I've been running a 60 Amp Plane Power alternator for almost 6 years with an LED indicator lamp from Stein wired to the alt failure lug on the alternator and it's been working fine for the entire time. I suppose the Stein Air alternator may have a resistor built into it, but I sure didn't add one.
My actual problem however is that it's been working perfectly all too frequently. The thing has been tripping the Alt Field breaker since the beginning. Yes, I have a 7.5 amp breaker in place. Started with a 5, and changed it when the problem became obvious. Same result. Also, yes, I've changed the plug connector as well.
The problem has been intermittent. Some flights the breaker won't trip at all, sometimes for many flights. Other times, it'll pop once or twice per hour or more or less. I haven't been able to find any scenario where it happens more than others.
The weekend before last, In 10 minutes time, it would pop the breaker almost instantly each time I pushed it in. Assuming the main alt trash, I went for a flight last weekend using the backup SD8 and thought I'd try the main alternator. Pushed in the breaker and it stayed online for the full 40 minute flight.
Anyway, I'm about done with the Plane Power unit and want to switch to an off the shelf unit from O'Reilley or somewhere, but that means I'll have to add an external regulator and OV protection.
All that said, my actual question is, how do I wire the alt failure light with the new setup. It seems the PP alternator has a lug for that but standard car alternators don't. Pretty sure this has been done, so I'm looking for the easy answer from someone who has gone before.