block heater plug gets hot - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 02-10-2013, 07:41 AM Thread Starter
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block heater plug gets hot

the plug on my block heater has been getting progessively warmer lately. it's getting to the point that the plug is feeling soft as in borderline melting. i'm running it on a 50' 12 guage cord. is this a sign of some type of emminent failure?
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post #2 of 15 Old 02-10-2013, 07:44 AM
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There is a short in the cable to make it heat up like that! should be replaced before it does damage
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post #3 of 15 Old 02-10-2013, 07:51 AM
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you can ohm it out and 50 foot is pretty far but for 9 amps it should be ok

a bad connection ( not tight fitting) at the plug ends can cause heat also

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post #4 of 15 Old 02-10-2013, 08:01 AM
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I use my pocketknife to spread the prongs just a little every couple weeks during the winter. The prongs, on mine, are two piece and get flattened and then don't make as good of contact.

2006 built 05/05 XLT CC DRW PSD. Captain chairs, sunroof, polished aluminum wheels, 6speed, manual 4x4. 285K miles with 130K problem free miles on new engine.
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post #5 of 15 Old 02-10-2013, 08:02 AM
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i think yours is just under 1000 watts but you should verify

here is various OHM/Amp element specs http://www.rheem.com/docs/FetchDocum...3-5c50dbcf3112

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post #6 of 15 Old 02-10-2013, 08:05 AM
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but for the plug itself to get hot to the touch, and if the cord it hot, there may be a short causing it to get hot
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post #7 of 15 Old 02-10-2013, 08:06 AM
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I just replaced the plug on mine yesterday. My Son and I were unhooking the truck and a HUGE spark flew out at us. Turned out it was a cut in the wire right at the plug. Scared the crap out of 4 year old boy! -Jason

1999 F250 Crew Cab Short Bed 4X4 Black 139,XXX miles bought 01/18/2012 No mods yet.

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post #8 of 15 Old 02-10-2013, 08:21 AM
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Thats what im saying! for it to be hot like that THERE IS A SHORT in the cable or the plug!
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post #9 of 15 Old 02-10-2013, 08:51 AM Thread Starter
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i'll put a new plug on the cable. the insulation may have deteriated & it's allowing some bleeding. i'd think an actual dead short would shoot sparks & blow breakers.
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post #10 of 15 Old 02-10-2013, 09:05 AM
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It's also likely that the "blades" on the plug need to be cleaned for a better contact with the extension cord. A poor connection would lead to higher resistance and heat build-up.

Take one of those green Scotch Bright pads and clean all 4 sides bright and see if it still gets hot before you buy another one...
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