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Old 10-02-2019, 05:07 PM   #1
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2016 28' International
Nicholasville , Kentucky
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Blown water pump fuse

Have a situation in the middle of a 14 day trip in a 2016 international 28í
We started our 500 mile trip home yesterday morning and when we stopped for the evening had blown the 15amp fuse that runs the water pump, tank monitors and battery voltage display. I had a spare and we spent the night with no problem. When we arrived at our destination this evening same fuse blown. We had to fill the fresh water tank because we will be here for 3 nights. And changed the fuse again before moving from the water source to our camp spot. Fuse was blown again when we parked a quarter mile away.
What I know:
1. Iím going to pull the fuse on the trip home because Iím running out of 15 amp fuses.
2. The trailer batteries show 12.7 volts not connected to the truck
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Old 10-02-2019, 05:34 PM   #2
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Hi

1) There is a pressure sensor on the output of the pump. It stops the pump before the pressure gets to high and the pump pulls to much current.

2) Crud in your fresh water tank can get into the pump and create issues, if the magic strainer is somehow missing in action.

3) Indeed pump motors do go bad .....

4) Wires chafe and short out.

That's a quick list. There are other possibilities.

Bob
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Old 10-03-2019, 10:31 AM   #3
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Hey Bob, thanks for the reply. I got cut off before. The rest of what I know is that with the truck disconnected and turned off the voltage at the 7 way is 12.2 and when the truck is on it goes up to 14.6. I donít have an amp meter with me. Voltage across the fuse is 12.6 when not hooked to the truck. Sitting in the camp site every think is working just fine, pumps, gages and all, but when I hook it to the truck when I am leaving Iím going to see how many seconds it takes to blow the fuse after my wife starts the truck.
While on shore power for 7 days the fuse was fine. And with the pump off the fuse blew while we pulled from the water spigot to the camp site. Disconnected the truck replaced the fuse. Everything working over night. It only has blown when connected to the truck. Which doesnít exactly make sense to me that only that fuse blows if it is the truck overcharging
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Old 10-03-2019, 10:56 AM   #4
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We are at Davidson River campground in Brevard NC. No cell service, primitive camping. The only time I can respond is when we go to town for something. Not an emergency, everything working till I hook back to the truck to go home. Just a brain teaser in a border collie type of guy
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Old 10-03-2019, 01:49 PM   #5
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One more bit of information. When I got back to camp I hooked up the umbilical cord to the truck and left it running for 15 to 20 minutes with no blown fuse. Could not find a loose connection behind the tank switches or where the wires hook to the water pump
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Old 10-03-2019, 02:10 PM   #6
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Low voltage = higher current draw and blown fuses. Charge up your batteries. I'm willing to bet you'll stop blowing fuses with better battery voltage.
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Old 10-04-2019, 07:11 AM   #7
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Quote:
Originally Posted by AtomicNo13 View Post
Low voltage = higher current draw and blown fuses. Charge up your batteries. I'm willing to bet you'll stop blowing fuses with better battery voltage.
Hi

If the pump motor looks like a resistive load, lower voltage will mean lower current. It's not a very fancy gizmo so I'd bet that is the case.

=====

Has the screen on the pump been checked for debris? That's a lot more likely issue.

Bob
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Old 10-04-2019, 01:17 PM   #8
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The water pump has never been turned on when either of the 3 fuses have blown. But it has been turned on ever since I parked in the camp spot 2 days ago with zero problem. Spoke with somebody at JC yesterday when I was in town. He was thinking short from loose connection vs the truck over charging. Movement + short out = blown fuse. Nothing in that Circut is in use when the fuse blows. Just bouncing down the road.
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Old 10-04-2019, 01:24 PM   #9
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Originally Posted by HC Dan View Post
The water pump has never been turned on when either of the 3 fuses have blown. But it has been turned on ever since I parked in the camp spot 2 days ago with zero problem. Spoke with somebody at JC yesterday when I was in town. He was thinking short from loose connection vs the truck over charging. Movement + short out = blown fuse. Nothing in that Circut is in use when the fuse blows. Just bouncing down the road.
Hi

If indeed nothing is ever on then indeed you have a wire somewhere in the trailer shorting out.

Bob
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Old 10-06-2019, 12:43 PM   #10
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There are 4 things that I know of on that circuit, the pump, the three tank monitors and the battery voltage monitor. Could I place inline fuses in each of those loops with maybe 10 amp fuses and sort out which on it might be? Itís going to involve doing something then driving around for an hour or two till something blows
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Old 10-06-2019, 01:32 PM   #11
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Hi

If you want to eliminate legs of the circuit, simply disconnect them.

Bob
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Old 10-06-2019, 04:55 PM   #12
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Oops guess thatís five
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