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Re: 3508b low system voltage alarm/ cat adapter 3

 
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3508b low system voltage alarm/ cat adapter 3

Does anyone know what the factory set point for low system voltage is? Will this alarm activate with the engine not running but the screen/ecm on? Referring to the 24vdc power.

Also I am unable to connect to this engine with the cat adapter 3 USB, I can see my ecm but it says not supported, is this the adapter or my version of cat ET??

Thanks