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Old 08-21-2018, 09:42 PM   #1
3 Rivet Member
1969 27' Overlander
Boise , Idaho
Join Date: Apr 2013
Posts: 150
Images: 4
Is My Powermax Dead?

I bought a Powermax PM3 a few years ago. The trailer has no battery, but it sat on shore power for a few years, until a couple years ago when the trailer ha dto be moved to a storage unit, and after that it only got used occaisonally. This week, when I plug into shore power, everything works fine for about 5-10 minutes. Then the lights would start flickering.

I pulled the unit after making sure it was getting 110V AC (it was). On the bench, when I first plug it in it puts out 13.6V as it should. Within a few minutes, the voltage becomes unstable, jumping from 4.5 to 5.9 to 14.1 to 9.3 etc. The unit also starts making odd hissing and clicking noises.

I opened the case and found the noises seem to emanate from a large object wrapped in yellow plastic film with two large wires going into it. Capacitor? Resistor? Got me.

Any hope for this unit, or should it go to the recycler?
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Old 08-21-2018, 09:50 PM   #2
Rivet Master

2007 22' International CCD
Corona , California
Join Date: Jul 2013
Posts: 9,098
Sigh. Unless the yellow object is clearly marked as to what it is and the value, itís not likely to be able to fix it. Easier and cheaper to replace the unit.
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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Old 08-21-2018, 10:10 PM   #3
3 Rivet Member
1969 27' Overlander
Boise , Idaho
Join Date: Apr 2013
Posts: 150
Images: 4
It's a transformer, and is marked SJ6.172.255 (which might just be a warehousing code). Even if I could identify the part and find a replacement (and there's an electronics store here where the staff would likely be able to do so), my soldering skills are not up to the task of replacing parts on a circuit board. Whenever I attempt that I end up melting stuff and puddling silver solder where it doesn't belong.

I wish I could remember whether I bought this converter new or used. If new, this does not seem like a very impressive lifespan.
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