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Old 10-18-2009, 10:06 AM   #1
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Emergency Start system & Circut board

In snooping recently I noticed that my Emergency Boost cyllenoid was warm (in the closed position) most of the time. I have checked it on the generator, plugged into 50a, Engine running.Batteries charged, etc. So in most cases the cyllenoid is in the closed position (Yellow wire is hot). Both black ground and yellow 12v wires go to the large circut board next to the cyllenoid. I disconnected the ground and the cyllenoid opened up. But when that cyllenoid is opened there is no cross charging. If the engine is running only the engine batts charge. SO how does the circut board work?? And if the cylenoid is closed most of the time when does it open to protect the 2 systems from complete discharge? I checked 2 other newer Dolphin's and found the same issue. I checked the wireing diagram and that cylenoid seems to be the ONLY link between both 12v systems. How does it work?
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Old 10-18-2009, 08:23 PM   #2
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That circuit senses both coach batteries and chassis batteries. If charging is occurring as a result of shore power or generator running, it will activate the solenoid to charge the chassis battery once the coach battery is above about 13.2 - 13.4 volts. Similarly, when traveling or just running the engine, the solenoid again will activate after the chassis battery becomes greater then 13.2 - 13.4 volts. The solenoid deactivates when the connected battery voltage drops below some level such as around 12.7 volts. This prevents the chassis battery from being drained by the coach.

The solenoid feels warm when ever either charging system is powered on and working properly.
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