REFLECTOR: How to protect the battery bus

[Keith Hallsten]

Hiroo,

 

Why is there a shunt in the starting circuit?  Starting will take several
HUNDRED amps, and there's no need to measure them.  A shunt that will work
at that range won't have much precision for normal electrical system
currents.  What are you really trying to measure?  If you put a shunt in the
alternator "B" lead you will measure what current the alternator is
producing, which seems useful to me.

 

Keith Hallsten

 

 

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Hiroo Umeno
Sent: Friday, February 16, 2007 11:56 AM
To: reflector at tvbf.org
Subject: REFLECTOR: How to protect the battery bus

 

Last weekend, I cranked the fickle Franklin one too many times.

 

(Yes, I am still trying to find out why it simply will not run.  Long
story.)

 

On the third cranking, the voltage on the battery must have dropped
sufficiently that the starter motor stopped turning the prop.  I probably
left my thumb on the starter button a tad longer than I should have.

 

The shunt blew and the whole electrical system went (except the backup
battery system that ran the instruments (glad to know THAT works well).

 

That got me thinking.  Shouldn't there be a CB or something protecting the
starter line?  I've heard that the starter line is the only line that should
NOT have a CB on.  Yet I've managed to fry the shunt.

 

Any thoughts?

 

Hiroo

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