[Vintage-race] battery Cut off with alternator

[Kendall Jones]

Dry circuit resistance (or carbon buildup) causes them to fail.  You should
never just off a running car (or otherwise electrically loaded circuit) with
these switches.  That causes an internal arc which over time builds up
resistance.

Looking at Ohms law (V=IR); low voltage / high current application are very
susceptible to small changes in resistance (think corroded battery
terminals)

I too used to buy the cheap flag style circuit breakers until it cost me a
national race win.  Either get the sealed style or the FIA style Solid State
relay setup. 

Kendall

-----Original Message-----
From: vintage-race-bounces at autox.team.net
[mailto:vintage-race-bounces at autox.team.net] On Behalf Of Ryan, Richard
Sent: Wednesday, January 13, 2010 12:24 PM
To: Tracy Drummond; vintage-race at autox.team.net
Subject: Re: [Vintage-race] battery Cut off with alternator

Just to chime in, we had 2 master kill switch failures in 2009, one in
an FV and one in a Miata.  In both cases the driver drove the car in
after a session and parked it.  Then the car would not start for the
next session.

The next one I buy will be the best one I can get.

What causes these switches to fail?

Dick Ryan  650-312-4022  (24022)
Director of Global Insurance Management
Franklin Templeton Investments
One Franklin Parkway   960/4
San Mateo  CA  94403-1906
Fax  650-312-5830  (25830)


-----Original Message-----
From: vintage-race-bounces at autox.team.net
[mailto:vintage-race-bounces at autox.team.net] On Behalf Of Tracy Drummond
Sent: Wednesday, January 13, 2010 8:39 AM
To: vintage-race at autox.team.net
Subject: [Vintage-race] battery Cut off with alternator

Which brand of cut off switch is best?  I need to also kill the
alternator.
I only saw this one that matches my application so far.
http://www.pegasusautoracing.com/productdetails.asp?RecID=1464


Also I am considering adding a quick fitting for battery charging but
cannot
find the grey two terminal set up.

Thanks guys

Warm Regards,

Tracy Drummond




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