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Bordercollie's avatar
Bordercollie
Explorer
Nov 21, 2013

Sluggish Genset Start from Panel

I notice that our 2004 26Q Tioga's Onan 4000 genset turns over sluggishly lately from the remote panel switch near the sink but turns over much more vigorously from the start switch on the genset itself. I imagine that this is because of resistance in the length of wiring from the remote switch to the genset. I also noticed that the genset starter is connected to the chassis starting battery, not to the house battery. The emergency start switch on the dash must momentarily connect the house battery and starting battery in parallel.

Is it possible that the generator start switch on the panel near the sink has become defective?

6 Replies

  • All the remote wires do is activate a relay or solenoid. Have someone stand by the generator while you try and start it.If they hear a chattering noise. You are losing voltage through the wires. Which can damage your system.
  • No codes, good genset to ground connection, all house battery connections just cleaned/good, house battery disconnect switch and relay seem good. Will try to get clues from Onan manual and contact Onan if needed. Wish there was an "all you need to know" resource about care, feeding and troubleshooting of typical inter-dependant Class C genset, converter/charger, house and chassis battery setups. I know that I'm not the only RV'er non-engineer that gets bewildered.

    I did find somewhat informative You Tube videos about troubleshooting of genset starting problems. I tried starting the genset from the panel today after running for over an hour yesterday, it started, so maybe problem will be mostly alleviated by more frequent running with load.
  • Bordercollie wrote:
    The two new 6-volt house batteries were fully charged as indicated by the charge wizard pendant on the new PD9245 converter. After four unsuccessful attempts to start generator from the panel near the kitchen sink, the charge wizard indicated that house batteries were in boost mode (solid green LED) I used the emergency start switch on the dash and the generator reluctantly started. Maybe the generator starter is actually connected to the house batteries and the emergency switch on dash connects the chassis/engine starting battery momentarily in parallel. I have noticed that IF the generator does not start quickly from the panel, AND if I try two or three times more, the starter stops turning over. If the genset has been run recently, it may start quickly from the panel. Generator carb has been serviced and oil changed a few months ago. Generator starter turns over much more vigorously from the starter switch on the genset itself. Have been motorhoming since the late 50's but need better understanding of my Onan 4000 micro quiet generator.


    If you do not have an owners manual there is a free downloadable one on the Cummins Onan website. There is also a troublshooting guide.
    Generally if the genny does not start after three trys there will be code flashing at the start switch.

    I assume you have checked all power supply connections including ground.
  • The two new 6-volt house batteries were fully charged as indicated by the charge wizard pendant on the new PD9245 converter. After four unsuccessful attempts to start generator from the panel near the kitchen sink, the charge wizard indicated that house batteries were in boost mode (solid green LED) I used the emergency start switch on the dash and the generator reluctantly started. Maybe the generator starter is actually connected to the house batteries and the emergency switch on dash connects the chassis/engine starting battery momentarily in parallel. I have noticed that IF the generator does not start quickly from the panel, AND if I try two or three times more, the starter stops turning over. If the genset has been run recently, it may start quickly from the panel. Generator carb has been serviced and oil changed a few months ago. Generator starter turns over much more vigorously from the starter switch on the genset itself. Have been motorhoming since the late 50's but need better understanding of my Onan 4000 micro quiet generator.
  • It is possible the switch is bad, but I would check for loose or corroded connections first.
    You are correct that the emergency start switch connects both house and chassis batteries.
  • I believe that you will find the wiring for engine start all end up in the generator. Then relays provide power to the starter. Could it be that when you are sitting in the drivers seat it just sounds different from when you are at the generator?