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turbojimmy's avatar
turbojimmy
Explorer
Mar 09, 2014

Onan Hour Meter

My '84 Allegro has a 6.5 NH generator with an hour meter in the dash. The generator runs, but the hour meter doesn't.

I guess the question is: how does the hour meter work? There are 2 wires on the back of it. Both house batteries are new and charged, but the battery health monitor (also part of the Onan panel) does not have a reading. Could this be part of the problem?

The generator has either been replaced, or at least removed and re-installed. The connector at the generator is spliced in. I checked the continuity of the splices (all good) and checked the wiring to the panel versus the Onan manual (all good, too).

It's a minor problem compared to the fact that I don't have a running 454 in the rig right now, but I'd like to fix it.
  • No, there are only 2 wires to the hourmeter. A 12 volt positive and a ground. The 12 volt positive comes from the Onan remote harness WHEN the APU is running. Doug
  • dougrainer wrote:
    The hour meter works by a 12 volt positive signal that the genset sends to the remote start switch next to the hour meter. IF the remote switch light is NOT on then the 12 volt signal is not there. The genset starts from a ground system and does not use 12 volt positive connections to start and stop. The battery indicator on your dash remote is a separate 12 volt signal to the remote. The hour meter just has a ground (negative) wire and the 12 volt positive that the genset sends out. It is common for such an old hour meter to not function. Doug
    Doug, this is a very simple and well explained post on how the genset hour meter works! Thanks Rooster