Free 7 Day Trial RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Free 7 Day Trial ×

Thread Tools Display Modes
Old 06-30-2019, 08:43 AM   #1
Junior Member
Join Date: Jun 2019
Posts: 5
Grey Wire on hot side of Battery Switch???

I just purchased a 2019 FLagstaff 5th Wheel 524LWS.
I am adding solar and a second battery. I was looking at the battery switch.
I am a believer in battery cut offs but thought they should cut EVERYTHiNG off!
I noticed that there is a small gray wire attached to the "always hot" side of the battery switch.

Any idea what this wire is for? Maybe smoke/CO detectors????

First post here but I am no rookie when it comes to forums and RV repairs and maintenance.

I will say that a Hungry Italian must have wired this thing as it reminds me a bowl of Spaghetti!
Shrimpy is offline   Reply With Quote
Old 06-30-2019, 08:47 AM   #2
Site Team
Flybob's Avatar
Join Date: Oct 2014
Posts: 13,579
Most likely CO/Propane detector as many are wired around the cutoff switch for safety reasons. Other items that are sometimes wired around the cutoff ( slide/tongue jack/breakaway) would require heavier wire.

2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 100W solar panels
Flybob is offline   Reply With Quote
Old 06-30-2019, 11:59 AM   #3
Senior Member
Join Date: Jul 2017
Location: North of Seattle, WA
Posts: 13,645
Originally Posted by Shrimpy View Post
I will say that a Hungry Italian must have wired this thing as it reminds me a bowl of Spaghetti!
Not just yours. Mine was the same mess even though just a "bumper pull".

I spend a total of several days just re-wiring battery system all the way to the converter. Upsized main wire and seriously cleaned up the "spaghetti" by installing a couple of bus bars and an enclosure designed specifically for the unbilical cord feeding tail/brake/running lights as well as +12V and Ground.

Also changed batteries to Battleborn LiFePo and added a DC-DC charger so my Tow Vehicle actually charges the trailer batteries at a decent rate (even though the voltage at the LiFePo batteries is much higher than FLA's.

I installed a separate battery shut-off switch where the batteries are now mounted, inside. Left the OE battery switch in place although now it only supplies power to jack and I can keep "busy little fingers" from messing with my tongue jack by switching power off at old battery shut-off.

When not in use I shut off Propane so I don't worry about the alarm being "dead" during storage.
"A wise man can change his mind. A fool never will."

"You only grow old when you run out of new things to do"

2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan
TitanMike is offline   Reply With Quote

battery, switch

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.

All times are GMT -5. The time now is 11:25 PM.