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Old 05-18-2024, 01:14 PM   #1
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DC Power issue

Having what I believe to be a converter issue. 2016 Jayco Pinnacle. I've got 13.6 to 14.4 volts coming out of the converter, but only 1.7 volts making it to the batteries. I've replaced the converter and batteries just 2 weeks ago. Batteries will not stay charged as 1.7 volts in is not enough. Checked all fuses that I can find. Any ideas what I am missing?
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Old 05-18-2024, 02:01 PM   #2
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Wires from the converter to the battery are at fault, possibly a blown battery fuse, battery disconnect turned off, or a very bad ground wire connection. Shouldn't be too hard to figure out if you have a volt/ohm meter.
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Old 05-18-2024, 02:08 PM   #3
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I've got a meter. All fuses have continuity that I can find. All 12 volt system are working, but just not charging the batteries. I have a charger connected to the batteries at the moment to keep them charged
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Old 05-18-2024, 02:53 PM   #4
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Where exactly did you measure 1.7 volts? If that was across the battery then either your battery is toast or your meter is not working properly. By chance was the meter set to measure AC instead of DC? Is this a measurement of the cable coming from the converter without being connected to the battery?

Measuring 13-14+ volts at the converter shows it is working but for some reason it is not getting to the battery. If you measured across the 2 wires right at the converter, try measuring from the positive converter cable to the metal chassis.

As mentioned, the problem can only be in the connection from the converter to the battery. The negative connection will be done through the metal chassis so inspect the ground connections at each end (converter and battery frame connections).

The positive connection will be a cable run straight to the battery probably through a fuse or circuit breaker. Find that connection and measure from each lug to metal ground. Each side should measure 13+ volts if the converter is running or 12 volts (battery voltage) if the converter is off.

I have attached the wiring diagram that shows a typical connection from converter to battery. Not much going on there. It should be easy to trace, just don't forget the ground connections.
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Old 05-18-2024, 04:01 PM   #5
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Quote:
Originally Posted by JimD View Post
Where exactly did you measure 1.7 volts? If that was across the battery then either your battery is toast or your meter is not working properly. By chance was the meter set to measure AC instead of DC? Is this a measurement of the cable coming from the converter without being connected to the battery?

Measuring 13-14+ volts at the converter shows it is working but for some reason it is not getting to the battery. If you measured across the 2 wires right at the converter, try measuring from the positive converter cable to the metal chassis.

As mentioned, the problem can only be in the connection from the converter to the battery. The negative connection will be done through the metal chassis so inspect the ground connections at each end (converter and battery frame connections).

The positive connection will be a cable run straight to the battery probably through a fuse or circuit breaker. Find that connection and measure from each lug to metal ground. Each side should measure 13+ volts if the converter is running or 12 volts (battery voltage) if the converter is off.

I have attached the wiring diagram that shows a typical connection from converter to battery. Not much going on there. It should be easy to trace, just don't forget the ground connections.
I'm getting the 1.7 volts from the 2 leads at the batteries when they are disconnected from the batteries. I have the meter set to DC and have checked the grounds that I can find and all look clean and are solid connections
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Old 05-18-2024, 04:19 PM   #6
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Service required do not shift gears

My battery was dead so I used the RV jumper battery (2021 Jayco Melbourne). After I got the Sprinter started I received a warning “SERVICE REQUIRED DO NOT SHIFT GEARS” I ran it for an hour but the message won’t go away. Now I’m stuck.
How do I clear the warning
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Old 05-18-2024, 04:49 PM   #7
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CDove I see this is your first post. If you have a motorhome you should post there so as to get an appropriate answer.
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Old 05-23-2024, 12:49 PM   #8
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Looks like our issue is a bad battery disconnect switch. Ordered a new one and will get this problem behind me.
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Old 06-10-2024, 08:14 AM   #9
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Well I thought it was fixed....NOPE

We put in the new disconnect switch and it appeared that things were working right. Fast forward to the next day when using the lights and such and the battery voltage drops to 11.7. The green light is flashing saying it is charging the batteries, but it really isn't. The fans have never run on this new converter so I am wondering if I have a faulty "New" converter. I ordered another one and will put it in this Friday. We leave for Colorado Saturday so I am hoping this is the issue. For now I have to keep a battery charger on to keep voltage up.
On another note. I can hear the inverter running on an off. Does anyone know if the fridge circuit runs through the inverter even when on shore power? I can't understand why the inverter would be running all the time on shore power.
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Old 06-10-2024, 08:21 AM   #10
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Originally Posted by MikeNChelle View Post
On another note. I can hear the inverter running on an off. Does anyone know if the fridge circuit runs through the inverter even when on shore power? I can't understand why the inverter would be running all the time on shore power.
The INVERTER has a built in transfer switch so the internal electronics will heat up and the cooling fan will kick it.
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Old 06-10-2024, 10:32 AM   #11
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Quote:
Originally Posted by MikeNChelle View Post
We put in the new disconnect switch and it appeared that things were working right. Fast forward to the next day when using the lights and such and the battery voltage drops to 11.7. The green light is flashing saying it is charging the batteries, but it really isn't. The fans have never run on this new converter so I am wondering if I have a faulty "New" converter. I ordered another one and will put it in this Friday. We leave for Colorado Saturday so I am hoping this is the issue. For now I have to keep a battery charger on to keep voltage up.
On another note. I can hear the inverter running on an off. Does anyone know if the fridge circuit runs through the inverter even when on shore power? I can't understand why the inverter would be running all the time on shore power.
Inverters typically have an internal by-pass or transfer switch in them. You might have a resettable circuit breaker that is keeping from charging the battery. My house batteries went dead and I started the engine to let the alternator charge it. The breaker is typically rated at 50 amps. It was a 1” thin black square and had a reset button about the size of the clicker on an ink pen. Hope you find your issue soon!
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