I boondocked in my 2021 13-foot Scamp over the weekend, running the lights and roof fan from the battery, since the campsite had no electrical hookup. When I then plugged my Scamp into the 7-pin connector on my tow vehicle and drove home, I expected the battery to get recharged from the tow vehicle’s electrical system. However, upon arrival home I discovered that the 20-amp battery fuse (in the fuse panel) had blown. The Scamp user manual seems to suggest that I should instead have recharged my depleted Scamp battery using a trickle charger. Did I make a mistake by attempting to recharge from the tow vehicle, after boondocking? If so, can anyone recommend a current limiter that would prevent the battery fuse from blowing when recharging from the tow vehicle?
Mon, 08/22/2022 - 09:08#1
Battery fuse blown when reconnect to vehicle after boondocking
I’m surprised that you are getting no response, but on the other hand after several years if towing an RV I’ve never heard of it before. I’d not decide based on a one-time event. One way to limit current could be a DC to DC charger, but that’s a little pricey if you do not really have a problem. I use a 20-amp DC to DC charger, but have it set to 10 amps. Is the Subaru trailer plug factory wired or dealer installed. BTW, a trickle /maintenance charger is good for keeping a battery charged but is VERY slow at charging, your RV converter would do a better job.
The fuse that blew is in the Scamp's fuse panel, and is labeled "Battery / 20 amps". The trailer plug is dealer installed. I've made several problem-free trips with my Scamp, but this is the first time I've tried boondocking.
You've given me my answer: This misbehavior is not typical among Scamp owners. (I got similar guidance from Scamp customer service). I'll assume this was just a one-time glitch, and will replace the fuse and see if it happens again.
It takes almost 25 amps to blow a proper 20A fuse, and it's hard to get 25A from a TV through the 7pin connector, especially if the battery wasn't near dead. I'd bet on a bad fuse unless it happens again.