Alternator exciter

[klutched]

Just finished installing my new AiM MXP dash. Thought I would run into this issue of the alternator not charging.

From what I've read the exciter wire runs from the dash to the alternator. Ign +12v puts power to the lamp while the alternator isnt charging. When the alternator is charging it changes the exciter wire from a gnd to +12v therefor the lamp becomes unlit. 

As I don't have a lamp there anymore can I get +12v from the ign with a resistor and connect it to my alternator exciter wire to get the alternator to charge again?

Thanks

Heres a little vid of the new dash

Edited June 11, 2020 by klutched

[klutched]

Also anyone know what size resistor would work?

[Murray_Calavera]

I'm going to run into the same problem in the near future, I was planning to use something like this as a solution - 

https://bluewireautomotive.com/products/alternator-exciter-bs-battery-14mm-led-warning-signal-module