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Old 02-21-2010, 08:46 PM   #1
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Tiffin Owners Club
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The Allegro Bus is finally home! and 1 small issue...

Loved driving it home, was quite a treat. Hated putting it away, would've loved to have just kept going! Oh well. Have to earn a living to pay for the thing!

Here 'tis, a 2000 Tiffin--
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She's a sweetie!

On to the issue-- Not a biggie, just a blown solenoid in the inverter compartment:

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As you can see, the right side post seems to have gotten a bit warm-ish, and spit itself and the cable out. The sticker says "CHARGING SOLENOID". Naturally, this solenoid is nowhere to be found in the coach wiring diagrams or the inverter installation instructions. Since the batteries seem to charge when plugged in to shore power, but not while driving, my assumption is that this solenoid activated by the ignition key, allowing the alternator to charge the house batteries?

Or...? (It'd be nice to know exactly what it does, thanks!)

Obviously I need a new one. It doesn't look all that special, should I replace it with an "exact" replacement, or will most any "generic" high-amp solenoid work? (In case this 'exact' replacement is ridiculously priced) ?

Thanks in advance!

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Old 02-21-2010, 09:01 PM   #2
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good looking rig
the toilet is sort of an odd layout, i could see my grandchild using it and stretching her head a bit to see whats out the front window.

USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, no your eyes are fine, there are really 6 slides
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Old 02-22-2010, 03:03 AM   #3
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A high amperage and continuous use rated solenoid should work fine as long as the "Bird" (bi-directional isolator relay delay) controller is good. The unit should probably charge both the chassis and house battery bank when plugged into shore power, generator or the main engine is running .
Mike, RVIA & RVSA Certified Master RV Technician
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Old 02-22-2010, 08:21 AM   #4
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As Mike says, that relay probably cross-connects the engine and house batteries for charging. That lets the engine batteries charge when on shore power and the house batteries charge when the engine in running.

It needs to be a continuous duty solenoid rather than momentary.
Gary Brinck
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Old 02-22-2010, 09:58 AM   #5
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By "continuous duty" vs "momentary", are you saying this solenoid's default "at rest" state is ON (normally closed) and it's switched state is "OFF"?

Or is that just the rating? (just want to be sure!)
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Old 02-22-2010, 12:13 PM   #6
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Nice looking rig. The toughest part is always having to balance work with enjoying it. I have that problem too.

You don't have a BIRD on that unit. What you do have is a 100 amp chargesolenoid that is triggered by the ignition switch. This solenoid is continuous duty, not momentary. That just means you can run it for a long time without burning it up, unlike a starter solenoid. It's normally open until the ignition key is switched on. When parked it will remain open, in an unpowered state, so that your chassis batteries and house batteries are kept separate. That way you won't drain your engine starting batteries when camping. As soon as you start the engine this solenoid enages and connects bioth battery banks together so that your engine's alternator can charge both systems while driving. In addition, if you have an Auxiliary Start switch on the dash it will temporarily engage this solenoid so that you can use the house batteries to help crank the engine should the chassis batteries be weak.

That particular solenoid isn't know for being the most reliable. I'd recommend going with the larger 200 amp solenoid that they now use. It's a White-Rodgers (Stancor) # 586-902. You can get them at this link - Stancor / White-Rodgers - 586-902 - Allied Electronics and it'll be less than what you pay at an RV dealer.
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Old 02-22-2010, 06:08 PM   #7
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Many thanks for the info guys, MUCH appreciated!

2000 40' Tiffin Allegro Bus \ 2003 Chaparral 260 SSI
1988 53 x 14 Skipperliner \ 1995 32' Party Cruiser
1984 Goldwing Aspencade \ 1976 Harley Sportster
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