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Date: Tue, 25 Jan 2005 10:55:44 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Battery load test
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<... round one with a red plastic "key", mounted directly on the battery 
plus terminal ... very convenient when fiddling with engine, starter, 
etc. ...>
Where might one acquire one of these "battery masters"?
I could sure use one ... Jim S.

Finn Lassen wrote:

> Funny you should mention that. That's what I use as a master switch 
> (this one is a round one with a red plastic "key"), mounted directly 
> on the battery plus terminal. No master contactor (solenoid) to drain 
> the battery. I usually leave it on when not tied down at home and 
> always get helpful comments about how I've left the power on (engine 
> monitor warning LED is lit). But actual power draw between my EM and 
> handheld Icom and GPS is well less that 0.5 amp. Can sit there 1/2 day 
> and still no problem starting.
>
> And yes it is very convenient when fiddling with engine, starter, etc. 
> to be comfortable that there is no power out there to be shorted to 
> ground.
>
> Finn
>
> Paul wrote:
>
>> Hi, Mark....unfortunately, I am presently working as a heavy truck 
>> mechanic (18 wheelers), and I have been on many a road call where the 
>> starter was stuck engaged.On a few units, once I disconnected the 
>> batteries (4 of them) the starter would be OK to use again. On two of 
>> the trucks, I could not get to them in time, and it burned the wiring 
>> harness so badly that the whole harness had to be replaced. The other 
>> tractor burned to the ground. Melted all the tires, all windows gone, 
>> all fiberglass hood and fender parts melted....not a pretty picture.
>> I have a quick disconnect on the negative terminal on my motor home 
>> so that if the starter solenoid should hang up, I can simply open the 
>> blade-style switch and disconnect the battery. Hopefully I will never 
>> need it, but it's nice to know it's there just in case. I have been 
>> looking at the various battery switches/quick disconnects at West 
>> Marine, and have been considering one for my aircraft. Heck, it's 
>> convenient jus to be able to quick-disconnect the battery when 
>> working on the panel, fuel pumps, spark plugs/wires, etc. Just a 
>> thought. Paul Conner
>>
>>     ----- Original Message -----
>>     *From:* Mark R Steitle <mailto:mark.steitle@austin.utexas.edu>
>>     *To:* Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
>>     *Sent:* Monday, January 24, 2005 8:47 AM
>>     *Subject:* [FlyRotary] Re: Battery load test
>>
>>     Wendell,
>>
>>     There is some benefit to using a starter relay in addition to the
>>     starter solenoid. The argument is that this arrangement will keep
>>     the fat wire going to the starter from being always hot. Also,
>>     I’ve heard stories of starter solenoids sticking with no way to
>>     stop the starter until it runs the battery dead. Not sure I buy
>>     that argument though. I tied my alternator B+ wire to the battery
>>     terminal on the solenoid (mounted on firewall) rather than
>>     running it all the way back to the battery (in the tail). I also
>>     picked up on the same B+ terminal to provide power to the Main
>>     Power Buss. This saved about 25’ of heavy gauge wire, offsetting
>>     the weight of the solenoid.
>>
>>     Mark S.
>>
>>         Refering to the battery going directly to the starter, most
>>         all starters with built in solinoids are so wired. I remember
>>         having a starter to hang on occasion and drain the battery or
>>         ruin the starter. Is it practicle to use a relay in
>>         conjunction with the starter/solenoid set up?
>>
>>         Wendell
>>
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>>>> Homepage:  http://www.flyrotary.com/
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>>>>