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Old 05-01-2009, 09:43 PM   #15
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1982 28' Airstream 280
Venice , California
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So it seems the only issue is a wiring problem (PO totally hacked this girl up before I got to her) so that the Gen is starting off the Chassis battery and not the House battery. Right? Because if it starts off the house battery and charges the house battery, everything is great.

So to clarify, is the Generator supposed to start off the house battery or off the chassis battery? Votes?
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Old 05-03-2009, 08:34 PM   #16
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Dale,

You are partially correct. However just about all generators have secondary AC taps that provide 12 to 18 volts AC (can't remember the exact number) that goes through a rectifier which converts it to 12 to 15 vdc. This 12 to 15 vdc is then used to charge whatever battery that was used to start the generator.

If you have a Kohler generator like the 7cm21-rv installed in our 310, the generator provides 7 amps at 12 vdc to charge the battery.

It sounds to me like you are having a problem with your generator battery charging circuit and should have it looked at.

Brad
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Old 05-04-2009, 01:50 AM   #17
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1989 34.5' Airstream 345
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The generator battery IS the chassis battery...Turn the chassis disconnect switch off(located behind the rear barrel chair, on the wall), and there will be NO power to the generator starter OR the motor starter...have replaced both solenoids at one time to rectify a starting problem...when the chassis battery was low and I used the glovebox switch to 'boost it' to start the engine, it worked...BUT, when I tried to start the gen right afterwards, the engine died...I made a set of short(18") jumper cables to cross the batteries in the drawer(house to chassis), and more than once have used them to fire up the generator, so I could plug in the portable battery charger in the outside outlet to hook up to the chassis battery to achieve a responding charge...side-of the-road mental lightbulb, but it works...someday, I may even learn WHY this works, but in the meantime...it works.
m
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Old 05-04-2009, 10:50 PM   #18
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Originally Posted by dalefox View Post
BTW, here's another great image from that same trip. Enjoy!



/d
Thanks for the info, Dale...Joshua Tree is on our"Must Do" list, so we'll get there eventually...

Hopefully sooner rather than later!

Happy Trails to you and your Pup...
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Old 05-14-2009, 07:14 PM   #19
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1983 31' Airstream310
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Originally Posted by dalefox View Post
So it seems the only issue is a wiring problem (PO totally hacked this girl up before I got to her) so that the Gen is starting off the Chassis battery and not the House battery. Right? Because if it starts off the house battery and charges the house battery, everything is great.

So to clarify, is the Generator supposed to start off the house battery or off the chassis battery? Votes?
I think you have it nailed with the PO hack idea, but they probably hacked the generator too, not just the wiring. My 1983 310 diesel has an Onan NH generator, which has a trickle charger for the battery circuit. See the schematic diagram in the service manual, there is a low voltage output from the field winding going through a current limiting resistor and diode that charges whatever battery the generator is connected to. The book says it's supposed to provide 1 to 1.5 amps of charging current. Is yours an NH model or which?
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Old 05-15-2009, 11:54 AM   #20
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The generator should start off the chassis battery. m
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