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Old 06-07-2019, 11:49 AM   #1
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House batteries not charging

While engine is running I am getting no charging voltage to the house batteries. I have a 2018 Coachmen Prism Elite 24EF. Batteries do charge when hooked up to shore power. Found and checked large 240Amp fuse in box next to battery box. WFCO who makes electronic controller thought it was a bad diode on main circuit board. Bought a new one and changed out without any change. You tube suggestions talk about a solenoid between engine and house and talk about a "click" after starting engine, but I hear nothing. Where is this mysterious solenoid located? Any other suggestions? Thanks in advance.
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Old 06-07-2019, 03:44 PM   #2
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Might be under the passenger seat. There's supposed to be some battery connection/separation wiring and parts under there, based on the threads by people who add the Trik-L-Start chargers to their coach/chassis battery charging configuration.

Just a guess.
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Old 06-08-2019, 08:04 AM   #3
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Charge relay for sure. Give Coachman a call and ask them where it is located. Under the passenger seat seems to be the location for 2016 and newer Sprinters.
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Old 06-08-2019, 11:15 AM   #4
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Solenoid location

If you guys mean the "box" right under the seat cushion, there is nothing there but a couple of low voltage wires. Do you mean under the floor? I called Mercedes and the Sprinter tech says they are not allowed to put any after market add ons in the front. Spoke to a tech at Lazy Days and he didn't know but said they are usually placed near the house batteries. Found nothing. Will have to wait until Monday to call Coachmen. Thanks for the response.
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Old 06-10-2019, 11:26 AM   #5
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At last

Found it! It's in the smaller box next to batteries under step. Was looking for a silver cylindrical can, but this one is black and kind of rectangular. No one had one locally so I ordered a similar Trombetta on line. Keeping my fingers crossed.
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Old 06-15-2019, 08:20 AM   #6
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Update

Success! Replaced the solenoid but it was not the problem. Traced the positive cable back to the battery. Access to battery is under driverís side floor. Mercedes has fuses and a power distribution panel tucked in next to battery (see image). Blown fuse. Tough to find locally. No luck at 2 auto parts stores, Lazy Days parts department and Mercedes dealer. I know Camping World gets some bad reviews, but they could not have been more helpful (and didnít even charge me for a fuse). I did learn an awful lot of information about my electrical system!
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