Some days
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Fleet Mechanic
Joined: Oct 2007
Posts: 1,972
Likes: 104
Some days
I bought a new travel trailer last month and have been getting it ready to take 3-6 week trips every few months for the next several years.
One project is upgrading the 70ah lead acid trolling motor battery it came with to a 314ah lithium battery, That also required a new and larger battery box.
I removed the 70ah battery and put it on Marketplace, it sold in 30 min.
Two weeks later I have the new and improved battery box installed, the new battery installed, a new ground cable to replace the crappy one that somehow was on a new travel trailer.
13.1v at the battery, zero volts at the breaker box.
I checked every nut and bolt, checked every fuse and breaker, used a multi-meter on every connection. Removed the converter and checked it. No 12v power.
I spent all day on the electrical system. No 12v power.
I keep the trailer at covered storage; I went home and started looking at the wiring diagram.
I see a switch labeled 'battery master disconnect switch"
Duh.................all is well, except for 9 hours down the drain.
One project is upgrading the 70ah lead acid trolling motor battery it came with to a 314ah lithium battery, That also required a new and larger battery box.
I removed the 70ah battery and put it on Marketplace, it sold in 30 min.
Two weeks later I have the new and improved battery box installed, the new battery installed, a new ground cable to replace the crappy one that somehow was on a new travel trailer.
13.1v at the battery, zero volts at the breaker box.
I checked every nut and bolt, checked every fuse and breaker, used a multi-meter on every connection. Removed the converter and checked it. No 12v power.
I spent all day on the electrical system. No 12v power.
I keep the trailer at covered storage; I went home and started looking at the wiring diagram.
I see a switch labeled 'battery master disconnect switch"
Duh.................all is well, except for 9 hours down the drain.
i ain't rite
Joined: Mar 2005
Posts: 65,492
Likes: 5,552
From: Marlboro Mental Hospital.
been there, and done that too.
i swear, the older i get, the dumber the simple things become!!
three weeks ago i spent close to 12 hours over two days trying to diagnose a dead golf cart. 48 volts out of batteries to computer. but no output from computer to anything. just as i was getting ready to order a computer i noticed someone turned the switch from run to transport, shutting off the computer.
i swear, the older i get, the dumber the simple things become!!
three weeks ago i spent close to 12 hours over two days trying to diagnose a dead golf cart. 48 volts out of batteries to computer. but no output from computer to anything. just as i was getting ready to order a computer i noticed someone turned the switch from run to transport, shutting off the computer.
Last edited by tjc transport; Apr 19, 2026 at 05:45 AM.
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