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Old 07-25-2019, 10:14 AM   #41
GreG L.
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I would think that breaker tripping won't be much of a problem in the summer months when the hydraulic fluid is nice and warm and thin, but winter does come around once in a while.
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Old 07-25-2019, 10:49 AM   #42
BB_TX
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It can happen any time. At least on ours. We typically have only used ours between April and October. And before I changed out the 50 amp breaker it would trip even in the summer months in TX.
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Old 07-25-2019, 07:17 PM   #43
Mikendebbie
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breakers-n-fuses

When we get back home I intend to install a Magnum 125 amp in-line fuse on my inverter line (that BB found on amazon for me - less than $50) and move the 80 amp breaker over to serve the pump. I will post pics when it is done with notes to hopefully help the next "chimp in space capsule" like me.
This thread has helped me a bunch!
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Old 07-30-2019, 05:42 PM   #44
glendodom
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Issue of T-Fuse on Inverter Line

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Originally Posted by Mikendebbie View Post
I have a 2018 model and I am confused like the original poster. My issues started in month 11 of ownership. My unit had a 50 amp (black) manual reset breaker on the red wire going to the inverter switch (round red/green switch in the pics below). Carl’s pic is of a 2019 and it shows a magnum fuse in the same position as my OEM 50 amp resettable CB. This CB is the thing on my unit that was tripping during hydraulic system operation. I replaced it with an 80 amp CB and tightened all connections in the front compartment (because I did not realize it was the inverter wire not the pump wire)and fortunately had no issues until July 4th weekend when the system tripped. The 80 amp on the inverter line tripped first and I went out and reset the blade switch. Then the hydraulic system “paused” (tripped) but reset itself and continued to operate. This tells me it was the OEM 50 amp auto reset CB to the pump. It is the red capped item on the left. In the second pic you can see the red wire going from the red capped breaker on the left to the pump. I ordered another 80 amp CB yesterday and will replace it this week before we leave this weekend.

I don’t understand why the CB in the inverter line has been tripping - the OEM 50 amp and the replacement 80 amp. Again - I replaced the 50 amp on the inverter line because it looked just like the pics that have been shared in the many threads about the hydraulic system tripping (translation: I replaced it out of ignorance and luck I suppose). I did not know what those 2 little red capped things were. However I am not going to reinstall the OEM 50 amp CB...generally things are better now than they were in December.
----------------------------
I spoke with the Keystone/Montana Owners Customer Service today about the question of the T-Fuse strip on the inverter line versus my trailer originally having a 25 amp breaker. She advised since I was only running a residential refrigerator that the 25 amp breaker was all that was required versus the T-Fuse strip? I guess that means if we wanted to do otherwise we are on our own!
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Old 07-30-2019, 05:55 PM   #45
glendodom
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Hydr Pump Breaker upgrade

Reference the question of upgrading the hydraulic pump breaker from a 50 amp to the 80 amp breaker, I spoke with the Keystone/Montana Customer Relations Div today and discussed my continued issue of the slides causing In-Command system to basically shut off and reboot advising her I had seen where Lippert had a paper out advising of upgrading to an 80 amp breaker. She advised that they didn't show any such advisement from Lippert. She advised I could take it in to a shop and have them submit a technical issue with the situation for their evaluation. CW had already called themselves upgrading my breaker but had actually upgraded the inverter line breaker instead. I may be to the point of just doing it myself. Seems to be a losing battle getting the point over to both CW and Keystone!

For clarification, the picture attached of my wiring the breaker in the middle is the one where the wire feeds up to the hydraulic pump. As noted within the picture the original breaker doesn't look like the breaker to the Busman breaker to the left which feeds the inverter but as I understand Lippert advises to upgrade with a Busman 80 Amp breaker which looks like the one on the left. Correct?
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File Type: jpg Breaker, Fuse and Cutoff (2).jpg (379.8 KB, 4 views)
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Old 07-30-2019, 07:34 PM   #46
Mikendebbie
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Breakers and fuses

The sketch I included on post #10 above was wrong and I have tried to doctor it up a bit below. I labeled some items A B C and 1-2 for reference.

I intend to call magnum again and quiz them for the correct size fuse to install on my inverter line (A).

I intend to install an 80 amp breaker for my hydraulic pump in position (B). If you look at the breaker in the sketch on line A and how it is oriented with 1 on top and 2 on bottom - the 80 amp breaker on line B will have the wires at position 1 on top (electrical current out) and the wires at position 2 on the bottom pole of the breaker (electrical current in). I am told I will need to drill out the connections for the small red wires to get them to fit the breaker pole.
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File Type: jpg CD3BDE4D-A7D4-44A1-8807-5FA0DD35DF2B.jpg (143.7 KB, 5 views)
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Old 07-30-2019, 09:15 PM   #47
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Does anywhere know where to find the inverter for a 2018 3920. I don’t think I have ever seen it... I think on my unit it only charges the batteries.
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Old 07-30-2019, 09:23 PM   #48
glendodom
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Inverter Location

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Originally Posted by Last2Die View Post
Does anywhere know where to find the inverter for a 2018 3920. I don’t think I have ever seen it... I think on my unit it only charges the batteries.
You may be getting converter and inverter confused. The converter charges the batteries. Your inverter is converting 12V to 120 AC for operation of the refrigerator during travel. The inverter on my unit is mounted in the storage compartment on the driver side up in the top (front left side). The converter is within your panel system with the RV entrance way. The 3721 has the residential refrigerator with an inverter. As I understand it the 3720 doesn't have a resiential refrigerator thus I presume it wouldn't have an inverter.
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Old 07-30-2019, 09:37 PM   #49
Last2Die
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Quote:
Originally Posted by glendodom View Post
You may be getting converter and inverter confused. The converter charges the batteries. Your inverter is converting 12V to 120 AC for operation of the refrigerator during travel. The inverter on my unit is mounted in the storage compartment on the driver side up in the top (front left side). The converter is within your panel system with the RV entrance way. The 3721 has the residential refrigerator with an inverter. As I understand it the 3720 doesn't have a resiential refrigerator thus I presume it wouldn't have an inverter.
You’re right. I figured I did get them both confused. The converter is behind my fuse box right..? My 3920 has the rv fridge.
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Old 07-31-2019, 07:25 AM   #50
SheilaMontana
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Quote:
Originally Posted by Mikendebbie View Post
The sketch I included on post #10 above was wrong and I have tried to doctor it up a bit below. I labeled some items A B C and 1-2 for reference.

I intend to call magnum again and quiz them for the correct size fuse to install on my inverter line (A).

I intend to install an 80 amp breaker for my hydraulic pump in position (B). If you look at the breaker in the sketch on line A and how it is oriented with 1 on top and 2 on bottom - the 80 amp breaker on line B will have the wires at position 1 on top (electrical current out) and the wires at position 2 on the bottom pole of the breaker (electrical current in). I am told I will need to drill out the connections for the small red wires to get them to fit the breaker pole.
I added a relay on Monday and the wiring was slightly different than what you show. The terminal on mine where the larger wire feeds the hydraulic pump has two large wires, one for the pump and the other goes into the coach and I assume lands at the converter.
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Old 07-31-2019, 09:49 AM   #51
jcurtis934
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Inverters are rated in watts, fuses and circuit breakers rated in amps. 1000 watt inverter, 150 amp non resetting circuit breaker or fuse. 2000 watt inverter, 300 amp circuit breaker or fuse.
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