Alternating Alternator Lights

[Mark Hislop]

Jim:

I had the same problem on my 73 P. I found a modification, done on a Form 337, that allows you to swap out the original voltage regulators to regulators from 400 series Cessnas. These new regulators are wired together to give a truly paralleled system, thus both alternators are always sharing the load. I got the info and paperwork from CPA.

I agree with Kevin though, first make sure all of the rest of the charging system components....alternator diodes, brushes, connections, couplings, etc are as they should be. The paralleled regulators are, in my opinion, the way the system should have been designed in the first place, but the modification shouldn't be used to cover up another problem.

Mark