No DC power!

[Gliddenwoods]

 

I have no DC power. Can not find the problem/solution. Need advice.

Battery charging with my Bluetti power bank was success. I used my "PowerWatchDog" at the Bluetti. I also used a "grounding plug" at the Bluetti. Works great and my batteries are charging very nicely.

However (there always seems to be a "however") I have no DC power in the Oliver. All DC items are down!

Is there a "Master DC Fuse/Breaker" somewhere? Or other advice as to a solution?

(FYI. I started a conversation yesterday on how to charge with the Bluetti. Received good advice and it worked fine, however...  I started this new thread as this is a related, but new topic.)

Thanks much.

[Hokieman]

My 2021 E2 has an OptiFuse 12V 60A breaker under the street side bunk.   The best wiring diagram I have found that’s close to my model is the 2019 manual (page 43)  from the Oliver University.   See the breaker in the upper left side.   Another quick check is the CO monitor under the dinette.   That usually is always on, does not go through the circuit breaker.   If that has a light on, you have power coming in, so it is likely the breaker.  

Edited June 20 by Hokieman
Typo

[Gliddenwoods]

I checked both of these fuse/ breakers and neither one is tripped. They are located on the street side under the bed. 

[Gliddenwoods]

The "Master Light" switch and all the others except "Curb Awning" and "Rear Camera" would not turn. So no lights anywhere.

It remained that way for 7 hours. Just now it cured itself and all is working! What the heck just happened? Will happen again?

Signed, Confused.

[FloraFauna]

My truma cp plus control module went out one time.  I finally found the 1 amp fuse to it, pulled it out and placed it back in.  Then it worked again.  Just seem you are dealing with a loose connection or a janky fuse.  Better have the wiring diagram handy for the next time.  

[Rolind]

I have found that sometime the switches on the master panel just inside the door don’t work or work intermittently.  Usually if I turn them on and off a couple of times the problem resolves.  I’ve  always attributed it to a little fiberglass dust in between the contacts or a little oxidation of the contacts from disuse. It has been a little annoying but not a serious issue.  The only other switch issue I have had was when one of the spade connectors fell off the pump switch in the bathroom. When that happened, only the switch by the Truma control panel would turn on the pump.

[Gliddenwoods]

10 hours ago, Rolind said:

I have found that sometime the switches on the master panel just inside the door don’t work or work intermittently.  Usually if I turn them on and off a couple of times the problem resolves.  I’ve  always attributed it to a little fiberglass dust in between the contacts or a little oxidation of the contacts from disuse. It has been a little annoying but not a serious issue.  The only other switch issue I have had was when one of the spade connectors fell off the pump switch in the bathroom. When that happened, only the switch by the Truma control panel would turn on the pump.

I plan to replace the Master Switch upon my return home. Appears to be an easy fix.

[Ronbrink]

21 hours ago, Gliddenwoods said:

However (there always seems to be a "however") I have no DC power in the Oliver. All DC items are down!

Check the connections going into the back of the DC panel under the rear dinette seat. I had a similar problem and found a spade connector loose. A little crimp for a tighter fit of the red power wire was the solution. 

[Gliddenwoods]

12 hours ago, Ronbrink said:

Check the connections going into the back of the DC panel under the rear dinette seat. I had a similar problem and found a spade connector loose. A little crimp for a tighter fit of the red power wire was the solution. 

Thanks; will check.

[Steph and Dud B]

On 6/20/2026 at 9:54 PM, Rolind said:

I’ve  always attributed it to a little fiberglass dust in between the contacts

This. We had this problem with multiple control panel switches. Solved it by blowing canned air into the switch while exercising it and placing a shop vac hose directly over the switch after exercising it. Also vacuumed out the back side of the control panel. Had to do this a couple of times during the first year of ownership. Been fine ever since.