I am experiencing a problem with my HWH Jacks. The jacks operate fine, raise the coach, retract with no issues. But upon retracting (pressing the store button) the inline 40 amp fuse holder (by the pump) completely melted and was smoking. Called HWH and they said to replace the corroded fuse holder. I removed the melted fuse holder, replaced with only a new 40 amp blade fuse to observe. When raising the jacks, the wires and fuse itself stay completely cool. But when pressing the "STORE" button, the jacks retract, but the wire and 40 amp fuse itself get very hot. Fuse does not blow, but the fuse and connectors are very hot. Anyone have an idea on what the problem could be? I don't want to simply replace the fuse holder, because I think it will likely just melt again. seems to be a problem somewhere, but I don't know where to look next.2001 Itasca SuncruiserHWH Model 310 Leveling jack system.

There's a lot of resistance right where the heat is.

In STORE, the only real draw is the 4 solenoids. The solenoids used to be on 4- 10 amp fuses. 1- 10 amp per solenoid. What your problem points to, is, something in store is pulling excess current. The solenoids operate the same in extend. So, you need to observe if that fuse holder gets HOT like it does in store. I will bet it does. Your problem is, you NEED to replace the fuse holder. It has been compromised by the previous failure and THAT will cause resistance and heat. I would also disconnect each solenoid 2 wire quick connect 1 at a time and see if one of the solenoids is causing the heat. You could also disconnect all 4, hit store and see if the wire gets HOT. If NOT, then 1 of the solenoids is failing. Do NOT run in store more than 10 minutes. Those solenoids cannot withstand a constant power to them. After 15 to 30 minutes the coils WILL overheat and destroy the solenoid/s. Doug

A pic would help. The resistance could be where there's a connection to the fuse holder, a crimp or the holder itself.

does this system use a single 'dump' valve for all jacks ?its 'odd' that you can run a pump and multiple valves while 'extending' the jacks to levelbut blow a fuse on retract, when the only load is open one or more valvescould the power control wire for the dump valve be shorted, or the dump valve coil be bad, it should be getting hot if it is blowing that 40 amp fusei would check those coils for 'excess' heat

Still working on this. The 40 amp fuse does NOT blow. I am using a blade fuse labeled 40 amp ATC. Is that the right type of fuse? If I put in a 15 amp fuse, it will blow when I press Store, but it does not blow the 40 amp fuse.I cleaned up the connectors and made them tight on the fuse. It seems the fuse and connectors now get fairly warm, but not scorching hot as before. But the 40 amp fuse does not blow. Want to make sure I am using the correct type of fuse. I don't know ATC from ATO type fuses

HWH Fuse holder melted - wire gets hot when storing jacks

time2roll
Nomad
Apr 09, 2018
I would use a step down butt connector assuming the RV wire is #8 or #10. Seal with heat shrink.

Something like this: #6 to #8 butt connector
MrWizard
Moderator
Apr 09, 2018
i replaced (2) coils in my system, and they draw less than 2 amps each
"HydraForce
• Part number: 6352012"

don't know what the OP has in his system, but near 10 amps per coil, seems high
time2roll
Nomad
Apr 09, 2018
Clamp-on DC ammeter would tell the real story.
dougrainer
Nomad
Apr 09, 2018
I did not state 10 amps per coil.

I stated that each coil is PROTECTED by a 10 amp fuse. Doug
kmb1966
Explorer
Apr 09, 2018
dougrainer wrote:
I did not state 10 amps per coil.

I stated that each coil is PROTECTED by a 10 amp fuse. Doug

I tried putting my multimeter on amps and see what it is pulling but I could not get an accurate reading. I pushed 'store' and then took the reading, it only read 0.01 so I'm thinking I took the reading incorrectly, or it is only pulling amps at the moment that the 'store' button is pushed. But since it does not blow a 40 amp fuse, but it will blow a 15 amp fuse, I think I can assume it is pulling more than 15 amps, but less than 40. I might put a 30 in there and see if it blows the 30. New fuse holder gets delivered in a few days.
MrWizard
Moderator
Apr 09, 2018
To read amps with multimeter, you have to disconnect one wire of the coil and put the meter inline in the circuit
Or
Use a clamp on DC amp meter

And yes it will only read while the Jack's are retracting, that is when there is power bring applied to the coils
dougrainer
Nomad
Apr 09, 2018
kmb1966 wrote:
dougrainer wrote:
I did not state 10 amps per coil.

I stated that each coil is PROTECTED by a 10 amp fuse. Doug

I tried putting my multimeter on amps and see what it is pulling but I could not get an accurate reading. I pushed 'store' and then took the reading, it only read 0.01 so I'm thinking I took the reading incorrectly, or it is only pulling amps at the moment that the 'store' button is pushed. But since it does not blow a 40 amp fuse, but it will blow a 15 amp fuse, I think I can assume it is pulling more than 15 amps, but less than 40. I might put a 30 in there and see if it blows the 30. New fuse holder gets delivered in a few days.

In STORE, all 4 solenoids are powered, not just one. Doug
wa8yxm
Explorer III
Apr 09, 2018
Most of those in-line blade fuse holders are only rated for 20-30 amps (Some less) so you are really working it. As you did, cleaning it up and tightening is the "Fix" but you may wish to consider changing to a different type of fuse holder.. One with a higher rating, and sorry. I do not have any suggestions. Other than possibly a Maxi Fuse holder. Do not know the ratings on those.
dougrainer
Nomad
Apr 09, 2018
wa8yxm wrote:
Most of those in-line blade fuse holders are only rated for 20-30 amps (Some less) so you are really working it. As you did, cleaning it up and tightening is the "Fix" but you may wish to consider changing to a different type of fuse holder.. One with a higher rating, and sorry. I do not have any suggestions. Other than possibly a Maxi Fuse holder. Do not know the ratings on those.

YOU BUY A 40 AMP RATED ATC FUSE HOLDER. THEY MAKE THOSE. HWH USES THEM. Doug

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HWH Fuse holder melted - wire gets hot when storing jacks

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