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  #26   IP: 107.0.6.150
Old 05-03-2016, 10:25 PM
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Originally Posted by Wisakedjack View Post
Here is what Blue Systems charging relay manual says about 'Start Isolation':

Start Isolation allows temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics from sags and spikes.

Its an optional feature.

I am planing to play with the couple of resistors to find optimal mode, but in general I agree that coil voltage should be less than 12V.
I think I understand. The isolation relay, when energized by the "R" terminal shuts off sensitive electronics until the engine is running - is that correct?
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  #27   IP: 69.122.70.64
Old 05-03-2016, 10:38 PM
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My guess is that the relay disables charging when starting engine to avoid voltage spikes in the system.
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  #28   IP: 73.255.216.151
Old 05-03-2016, 10:46 PM
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I took these coils off the two "spare" engine I have acquired.
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  #29   IP: 73.255.216.151
Old 05-03-2016, 10:50 PM
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this coil I had for 25 years, just sitting around. It was in a clear plastic pack, and never used.

The word passed down to me was that you ran a resistor with a coil in a 12 volt system. With 6 volts you did not use a resistor.
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  #30   IP: 107.0.6.150
Old 05-03-2016, 10:51 PM
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Originally Posted by Wisakedjack View Post
My guess is that the relay disables charging when starting engine to avoid voltage spikes in the system.
When cranking the voltage typically drops to around 10 volts while delivering 130 amps to the starter. But I suppose the low voltage could cause the regulator to energize the field real strong and cause the alternator to spike voltage just at start up. But if the alternator is charging the battery that just started the engine that should not happen.
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coil, ignition, no spark

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