Calling all electrical system sleuths
I have a 2007 Itasca sunova 35J house batteries charge when on shore power as well as when the generator runs, but not when driving. In a small compartment to the right of my steps are the two i...
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If you believe that the left solenoid is the isolator solenoid (and that sounds very likely to me), the next step would be to make sure it's getting a proper control signal. Check the voltage of the thin wire going to the control terminal (or across them, if there are two such terminals). You should see power there when the engine is running, possibly after a delay depending on the exact setup, and when the emergency start switch is activated if you have one.
If you have power at the control input when you ought to but the relay itself isn't activating, then the relay is bad. If you have no control signal, then the problem is likely not the relay but something upstream from it. If you have control power only when the emergency start switch is activated, then there are a couple of possibilities: your motorhome could be wired such that the isolator is separate and doesn't use this relay, or you could have some problem with the isolator control signal. This signal is probably wired through the emergency start switch, and might be able to be traced back from there.
If you have power at the control input when you ought to but the relay itself isn't activating, then the relay is bad. If you have no control signal, then the problem is likely not the relay but something upstream from it. If you have control power only when the emergency start switch is activated, then there are a couple of possibilities: your motorhome could be wired such that the isolator is separate and doesn't use this relay, or you could have some problem with the isolator control signal. This signal is probably wired through the emergency start switch, and might be able to be traced back from there.
