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Old 09-13-2021, 03:55 PM   #1
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2003 Itasca Horizon 36 LD

Looking to replace the fuse for the fresh water pump on my 2003 Itasca Horizon. Where might I find the fuse.. ?
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Old 09-13-2021, 04:48 PM   #2
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Have you checked the water pump power lines? Many have an inline fuse about a foot back from the pump in the wiring.
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Old 09-13-2021, 05:13 PM   #3
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X2

Mine is in the power lead. I have to get down on my knees to see it.
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Old 09-15-2021, 04:09 PM   #4
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No inline fuse is obvious. I can see where the circuit comes out of the harness, no in line fuse.
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Old 09-16-2021, 12:12 AM   #5
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According to the Body, 12 Volt Wiring Diagram for your coach the water pump gets its power from the wire labelled JA. The Wiring Identification Guide show that as
JA / 14 YEL OVERCURRENT PROTECTION (15A FUSE/BREAKER TYPICAL) WATER PUMP,MONITOR PANEL,ETC ("CLEAN CIRCUIT",REF JP)
That wire connects to a 15A circuit breaker in the House 12V Breaker Panel labelled 'MONITOR/TV', as can be seen in the Body, 12 Volt Wiring Installation diagram.
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Old 09-16-2021, 10:14 AM   #6
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Quote:
Originally Posted by cbeierl View Post
According to the Body, 12 Volt Wiring Diagram for your coach the water pump gets its power from the wire labelled JA. The Wiring Identification Guide show that as
JA / 14 YEL OVERCURRENT PROTECTION (15A FUSE/BREAKER TYPICAL) WATER PUMP,MONITOR PANEL,ETC ("CLEAN CIRCUIT",REF JP)
That wire connects to a 15A circuit breaker in the House 12V Breaker Panel labelled 'MONITOR/TV', as can be seen in the Body, 12 Volt Wiring Installation diagram.
Great tip. Will report back on progress when I resolve if this is the case or not.. THANKS... !
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Old 09-16-2021, 07:40 PM   #7
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Checked out the " Monitor/TV" breaker on the relay board. Sure enough, that is the breaker that also protects the fresh water pump. New pump "required" a 15 amp breaker, but installed with the other 2 accessories on, no overcurrent condition. This column is wonderful.. Why it wasn't identified plainly by Winne is beyond me. Thanks again..!!
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Old 09-21-2021, 04:17 PM   #8
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Quote:
Originally Posted by eazrider View Post
Checked out the " Monitor/TV" breaker on the relay board. Sure enough, that is the breaker that also protects the fresh water pump. New pump "required" a 15 amp breaker, but installed with the other 2 accessories on, no overcurrent condition. This column is wonderful.. Why it wasn't identified plainly by Winne is beyond me. Thanks again..!!
I have a different coach but i found my on the DC fuse panel that was under the refrigerator panel. I also put in an inline fuse right by the pump.
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Old 09-21-2021, 06:24 PM   #9
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Two years ago I had that complete circuit (JA) go dead on me. There was power coming out of the breaker under the fridge, but nothing worked - which included the water pump, much of the Monitor wall panel, some AV stuff above the dash, etc. I finally ran a new wire under the floor (Not easy!!!) from the breaker to the Monitor panel for some of it, ran a new fused wire from the battery to power the water pump, plus some other new wires and splices. It was a huge PITA to track everything down and get things repowered. I still have no idea what caused the problem or where it occurred, but it all works again now.
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Old 09-21-2021, 11:59 PM   #10
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I had a Ford F250 that had electric fuel pumps in the tank(s). When I would switch to the rear tank, engine would simply " run out of gas". After troubleshooting, I discovered no voltage at that fuel pump. Using a probe, I found an open in the wiring. Sliced it open with a razor, and found the manfacturer had solder spliced the wire inside the insulator and it had corroded and separated...go figure..
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