Alternator and starter breaker size??

[benbell4140]

Got all my breaker sizes figures out except the starter and alternator. Anyone know what size? It's a stock lycoming starter on an O360 and an alternator "kit" from vans. Not sure if it's a plane power or not.

Thanks

 

[cfiidon]

Wire Size

Your breaker sizes are a function of the wire sizes. What size wire do you have from your alternator B, and Alternator Field, and what size wire goes to your starter relay?

In my case I have 16AWG to my starter relay, and this line also feeds auxiliary power, so I have a 10A breaker. (Up to 15 is allowable)

My alternator is a 60 amp, with 6AWG so it gets a 60A breaker. (Up to 80A)

My alt field is 16AWG and has a 5A breaker. It's okay to have a smaller breaker for the wire, but not the other way around.

See AC43.13-1B para 11-49 and table 11-3.

Don