Dville_TX
First problem with my Corepower 5837 unit.

It did not run weekly exercise yesterday. All red led lights blinking; Checked battery and have 12.8 volts.
Put it in manual and starter solenoid made some noise. Checked starter solenoid control voltage and only 6V on coil, but still 12+ volt on battery.
Removed and opened controller. It is perfectly clean. Installed controller and no blinking led. Started one time and then blinking led came back again and low solenoid voltage again.

Any hints what to check?

Thanks.
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murphy
Load test the battery with a 100 amp load for 10 seconds.  The battery voltage should not drop below 10.5 volts during the test.  Voltage measurement only doesn't tell you much of anything about the battery.  All lights flashing, for most units that have lights, indicates exercise is not set.  Loss of the battery voltage during an attempted start could do that.  Is the battery more than 3 years old?
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Peddler
How old is the battery?  You are probably reading the battery charger voltage, leave your meter hooked up and try to start the unit and watch the voltage if it drops below 10 volts replace the battery.  If it is older than 3 years it may be due for replacement anyway.
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Dville_TX
Thanks guys,

Please see question below.

Battery is 2 years old, so I took it to the auto parts store for testing. It tested perfect. But problem was related to the 12 V circuit.

When I installed the battery I noticed that the positive lead moved on the solenoid bolt. That was the problem.
Sanded, cleaned terminal bolt and wire eyelets, and put some no-ox on the parts. Tighten up terminal bolt and it is working again.

I have had this generator since shortly after it was released, and not had any problems. Just normal maintenance.

Based on the age I might get something newer, but would prefer a generator the can be used with my transfer switch since it is recessed and all wiring in the wall.

Wire from generator to transfer switch was sized for 50 Amp during installation to be ready for upgrade.

What it any current generator can be used with my 50 Amp Corepower transfer switch?

Thanks.
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nrp3
I like the 9kw over the powerpact, but I’d need to see the wiring to assess the ease of making the conversion.  I have done this exact conversion and it worked out that I didn’t need to alter the wiring because the feeders were adequate to work with larger output of the 9kw. It’ll work fine with the existing transfer switch. You’ll also have to have someone look at the gas piping too. You may only need to rearrange the connection at the generator. 
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