HWH Fuse holder melted - wire gets hot when storing jacks

[kmb1966]

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 Suncruiser
HWH Model 310 Leveling jack system.

[dougrainer]

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

[wa8yxm]

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]

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

[MrWizard]

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

[kmb1966]

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.

[dougrainer]

I did not state 10 amps per coil.

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

[time2roll]

Clamp-on DC ammeter would tell the real story.

[MrWizard]

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]

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

[dougrainer]

https://www.hwhcorp.com/ml13514.pdf

The 40 amp fuse supplies the silver control box IF you have the 2001 model still. It goes to the control box(wire 6100). AT the control box is a 1/4 inch stud that a large gauge (10 gauge) ground wire is secured to that stud. IF that ground wire is not secure or the ground feed from the chassis source is weak/corroded, THAT will cause that type heat and failure on the 40 amp fuse. Pages 27 thru 29. Doug

PS, The white ground to that control box on that stud comes direct from the Ground wires AT the HWH pump mount bolts that hold the pump to the steel chassis mount plate. Verify the ground bolts are TIGHT on the 2 bolts on the pump mount.

[kmb1966]

time2roll wrote:
Is 40 amp the proper fuse? (appears correct according to Doug)

Maxi fuse holder: http://www.genuinedealz.com/maxi-fuse-inline-fuse-holder-w-6-awg-leads-up-to-60a
Not going to melt at 40 amps.

This is what I ordered. Now, any ideas on how I connect this in?
Do I crimp connectors on each end or do I splice the wires together? solder? how could I get it connected so that it is tight so less heat/resistance?

[brulaz]

In a similar "hot fuse holder" situation, I removed the fuse holder and upgraded it to a higher quality one.

That Maxi fuse holder linked above with a 40A Maxi fuse will prolly do the trick.

I take it the wires some distance from the fuse/holder remain cool?

[time2roll]

Is 40 amp the proper fuse? (appears correct according to Doug)

Maxi fuse holder: http://www.genuinedealz.com/maxi-fuse-inline-fuse-holder-w-6-awg-leads-up-to-60a
Not going to melt at 40 amps.

[ScottG]

The difference is ATC fuses are sealed and ATO isn't. So in a clean, interior environment the cheaper ATO is fine but otherwise, the ATC is best.
There is no other functional difference.