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Gary, Technician
Category: Car
Satisfied Customers: 17023
Experience:  GM master tech for 15 years/ASE master tech for 20 years
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Hummer H2: loss of power to compressor fuse inside dash for

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loss of power to compressor fuse inside dash for ac good fuse good under hood but no power test light won't light up even at fuse conector contacts other than a possible wiring concern under the fuse box what could be the problem?

Welcome to Justanswer ! my name is XXXXX XXXXX i will do my best to assist you with this problem

so the A/C compressor 10 amp fuse shows NO volts on either side of that fuse testing that fuse in place through the little openings in the tops of that fuse ?

Customer: replied 4 years ago.

correct the 10amp fuse in the dash is good the fuse in the PDC power distribution center under the hood has no power even when you pull the fuse the connection in the PDC have no power loss of current,

ok but your sure that 10 amp fuse in the under hood fuse box shows NO power either side of it ? im just making sure as it makes a big difference that's why im asking again to be sure
Customer: replied 4 years ago.

correct no power on either side.

ok can you see if the fuse IGN A 40 amp fuse shows 12 volts both sides of it ?
Customer: replied 4 years ago.

your meaning the 40amp fuse under the hood correct? If so then you mean I need to pull the fuse set the multimeter to dc volts an check the contacts.Should get 12 volts does that then run to the relay then the 19amp fuse in the box? It appears there is a jumper from DRL to the relay above it can't make out what it is but its got a dog gone resister in it was wondering is that factory or a recall or just shade tree mechanics?

wow it sounds shade tree if there is a random wire there with a resistor in it

the reason I need you to test that under hood 40 amp fuse is the a/c 10 amp in the under hood fuse box shows NO voltage either side

if that 40 amp fuse shows power both sides of that fuse testing that fuse in place through the little opening in the tops of that fuse there is an internal fuse box failure

as that 10 amp fuse should have power to it all the time and it gets its power internally inside the fuse box the SAME power as that 40 amp fuse gets

so if the 40 has it ( it should if the engine will run but we are confirming to be sure ) and the 10 does not the under hood fuse box is bad internally and needs to be changed

and I will bet that random wire you see was someone jumped something in that fuse box due to another fuse or power is missing and they jumped it with a wire as the internals of that fuse box where acting up before this a/c problem

that under hood fuse box has big battery power coming into it then that big power is shared to all the fuses

I hope this make sense to you and you understand what im saying

if you have any questions please ask

even after you rate us here at justanswer you can always get me back through this post with any follow up with this problem anytime !

Gary and other Car Specialists are ready to help you
Customer: replied 4 years ago.

so why is there power to the fuses at the dash if it starts under the hood wouldn't it not have power either? Also would it hurt or back feed the circuit if I put 12volts straight to the compressor?

the power is split up internally on a common bus bar circuit board set up inside the fuse box and some or one or a bunch can break and then fuses or a single fuse will not get power but the ones still connected will get power

yes you can run power to the compressor but make darn sure you fuse that wire with an inline fuse most autoparts stores sell inline fuse holders and just plug in a 10 amp fuse and use an ignition power source ( power only when the ignition key is on and the engine is running ) do NOT wire it power all the time ! as you turn the key off and it still will be activated will wreck the clutch in the compressor and kill your battery over night