Electrical Gremlin
Submitted: Tuesday, May 29, 2007 at 14:42
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GoneTroppo Member (FNQ)
Hoping for some advice, as there is a week's wait to get the only local sparks to look at it.
The F250 has KAB air
suspension seats, air supply is provided by a small compressor mounted under the bonnet which pumps to a reservoir.
Wiring goes direct from battery terminal to a relay looking thingy marked "Diac Safe" "ProQuip P1512X 12vDC 20/20a" from there a wire with a 20A inline spade type fuse goes to the compressor.
All worked
well for 9 months then it stopped. First thing to
check is the inline fuse, replace the blown one with a new one. Compressor runs for 2 seconds, blows the new fuse, try another fuse, same thing.
Checked all the wiring no obvious shorts, what's going on? What should I
check next?
Any advice is much appreciated.
Chris
Reply By: traveller2 - Tuesday, May 29, 2007 at 14:48
Tuesday, May 29, 2007 at 14:48
What sort of compressor and what sort of current draw? My Blue Tongue compressor pulls at least 25 amps. 20 amp fuse would blow!
AnswerID:
243193
Follow Up By: GoneTroppo Member (FNQ) - Tuesday, May 29, 2007 at 15:04
Tuesday, May 29, 2007 at 15:04
It's a Hadley model 850. Not sure of the draw. It's a US made thing that comes as part of the air kit for the seats.
FollowupID:
504156
Reply By: Mr Fawlty - Tuesday, May 29, 2007 at 14:53
Tuesday, May 29, 2007 at 14:53
Obviously the motor is overloading or shorting....Can you disconnect the plumbing & run the compressor light? can you
check the resistance of the motor windings, there should be some, not much but some. I'd be looking for a short, or semi short in the system, maybe one of the windings on the armateur or something like that.
Only other thing I can suggest is a Gremlinometer &
mine was stolen.
AnswerID:
243194
Reply By: GoneTroppo Member (FNQ) - Tuesday, May 29, 2007 at 15:10
Tuesday, May 29, 2007 at 15:10
This is the compressor fitted
Site Link
Think it's quite a good quality unit
AnswerID:
243199
Reply By: Member - Troll 81 (QLD) - Tuesday, May 29, 2007 at 15:53
Tuesday, May 29, 2007 at 15:53
My ARB one did the exact same thing and I ended upgrading the wiring and the problem went away
AnswerID:
243210
Reply By: GU-Nissan - Tuesday, May 29, 2007 at 18:50
Tuesday, May 29, 2007 at 18:50
Hi GoneTroppo,
From a site I found via Google
Cut n paste
Product Overview:
Hadley 850-Series Direct Drive Compressor
Product Details:
Hadley 12-Volt Direct Drive 1/6th Horsepower Mini Air Compressor Kit. This H.D. Hadley light weight constructed compressor weighs less than 3.1 lbs. and _Affordable_Storage_Drawers.aspx less than 15 amps on initial startup and 9 amps when running. With this compact compressor design, Hadley states that it can be mounted in any ventilated position. The typical operation is 110-135 PSI. It is an Intermittent Duty Compressor with a maximum run cycle of (7) min. and requires a (30) min. cool down. Since Hadley's internal parts are self lubricating (Oil Free) it means no maintenance required. The Compressor Measures 5.7''L x 2.12''W x 4.5''H
From this I would suggest that there is a fault of some type probably in the compressor itself. If so, the only thing I can suggest is to replace it.
Hope that helps.
Ross
AnswerID:
243278
Reply By: kangas - Tuesday, May 29, 2007 at 20:06
Tuesday, May 29, 2007 at 20:06
hi troppo, can you disconnect the airlines and see if it works without a load on it?
the other thing could be that the piston or something has seized, and stops it turning,
kangas
AnswerID:
243305
Reply By: Stu050 - Tuesday, May 29, 2007 at 21:13
Tuesday, May 29, 2007 at 21:13
An intermittant short where wires have been rubbing??
AnswerID:
243334
Reply By: GoneTroppo Member (FNQ) - Tuesday, May 29, 2007 at 21:28
Tuesday, May 29, 2007 at 21:28
Thanks everyone, I'll pull the airline off in the morning and see what happens when it's not under load.
AnswerID:
243347
Reply By: GoneTroppo Member (FNQ) - Wednesday, May 30, 2007 at 09:02
Wednesday, May 30, 2007 at 09:02
I've pulled the airline off. Runs and sounds normal.
As soon as you put your finger on the outlet hole (in the nicest possible way) to create load...fuse blows.
What does this mean? A new pump?
AnswerID:
243429
Follow Up By: Roktruk - Wednesday, May 30, 2007 at 16:13
Wednesday, May 30, 2007 at 16:13
Doesn't sound good - as soon as it loads up it sounds like something is shorting inside. From the looks of the pump, it should be fully servicable, may have a shorted brush or armature, other possibly is dodgy bearings causing the motor to twist under load and stall?
FollowupID:
504445