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Old 03-16-2021, 10:01 PM   #1
Junior Member
Brand: Thor Motor Coach
Model: Tuscany 45 LT
State: Georgia
Posts: 3
THOR #18398
2013 Tuscany Electrical Issues


We have a 2013 Tuscany 45LT and we are having issues when we plug into 15amp house plug, we use the step down dog bones but it comes on then goes off (when we plug in the inverter shows power is green and it says it is inverting, but then it shows red light on fault and shows overload) it cycles back & forth from power to fault.

There does not seem to have issues while we are plugged into 50amp or 30amp power.

Thanks, NeSmiths

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Old 03-16-2021, 10:29 PM   #2
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 9,718
THOR #7035
Your inverter should not be inverting if you are plugged into SP. And it can easily overload if the SP connection is intermittent and the inverter's Automatic Transfer Switch has problems.

Too many unknowns to diagnose over the web:

Do you have good dog bones?
Do you have a surge protector?
Do you have a power management system?
Does your inverter have an integrated charger or do you have a converter?
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
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Old 03-17-2021, 03:22 AM   #3
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Brand: Thor Motor Coach
Model: Tuscany
State: Texas
Posts: 392
THOR #1808
sounds like your surge guard or power management is kicking off so then the inverter jumps in to take up the slack.

can you see your input voltages and current for each leg? a 15 amp dog-bone plugged into a 30 am to a 50 amp is going to do some weird stuff to the power management system, you really only have 7 amps per leg

my coach is very very sensitive to such set ups and will kick off at the drop of a hat, if any thing comes on. battery charger is going to pull much more amps than the 7 per leg.
retired Navy driving the short bus 2008 Tuscany 4056
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Old 03-17-2021, 03:23 PM   #4
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Brand: Thor Motor Coach
State: Missouri
Posts: 2,164
THOR #6903
turn off everything, inverter and charger for sure, then plug in
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Old 03-17-2021, 03:38 PM   #5
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Brand: Thor Motor Coach
Model: Tuscany
State: Texas
Posts: 392
THOR #1808
Originally Posted by lwmcguire View Post
turn off everything, inverter and charger for sure, then plug in
yep that would maybe work.
retired Navy driving the short bus 2008 Tuscany 4056
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Old 03-17-2021, 04:49 PM   #6
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Brand: Thor Motor Coach
State: Georgia
Posts: 2,585
THOR #4735
when plugged into 15amp power, via a regular household outlet, it's easy to have many things in play without realizing it, such as high draws from the Battery Charger within the Magnum panel, the Electric water heater, if left on, or even the engine block heater switch(mine is on the side of my bed, which leads to easily and accidentally flipping it on!)...
while the Inverter can remain ON, even when you are plugged in, it is really only INVERTING when you DON'T have power - it otherwise does NOTHING when you do have power, so it should not have any impact on whether your outlet is providing power, or not. You could easily cut OFF the inverter, but it would actually make no difference on your shore power, but all your 120v power would also remain off when shore power is lost. Probably doesn't matter unless you have TV satellite receivers that must 'reset' every time this happens, etc.

If your inverter is going into 'fault' mode, it's likely not about shore power, but about the internals of the inverter/charger having issues with the battery connection, or the battery LEVELS. If your battery levels are low when you first plug into 15amp power, the Magnum charger may be trying to charge them, tripping it's fuse/breaker, but then resetting automatically, which mine has done also from time to time. The small round 'button' fuse breaker on the Inverter may not always automatically trip, but sometimes can miss power for a moment, then continue providing it the next, when it's right on the border of tripping totally. You may see a loss of power to 120v outlets and items only for a moment, such as a satellite receiver 'reset', for seemingly no reason, while everything else seems to continue working as normal. When it trips fully, though, you'll have NO 120v power from the Inverter, and you must then push in that fuse/breaker to reestablish Inverter AND pass-thru 120v shore power.

Because these systems are somewhat complex, and they are all 'interwoven', it can be a puzzle sometimes as to 'what' has actually lost power. I've run around on several occasions checking breakers in the main panel, breakers at the shore power, and even my battery wiring, only to find out it was the simplest of things - the small tiny tripped Inverter fuse/breaker - push it in and all is good again!
(this has typically happened when we overwhelmed the Inverter's pass-thru 20amp fuse/breaker by having too many electrical items plugged in and operating while even on shore power - since the outlets are ALL thru the inverter - several small space heaters on 'high' can easily do this.
the Turners...
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