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Old 07-25-2016, 10:02 PM   #1
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12v issue! Need pointers fast!

2016 Gulfstream Conquest LE 268BH

My fridge, porch light, and the 3 light fixtures down the center of the interior are all on the same 15amp fuse.

We've camped about 10 times since we got it in March and finally have an issue. On Sunday that 15amp fuse blew at some point on the way home or after we got here. I put my spare 15A fuse in and turned the fridge on with the porch and 3 interior lights off. All was good until I tuned on the porch light...poof! I was out of 15's, so I put a 10 in. Turned on the fridge with the other 2 off and the fridge fired right up. I turned on the porch light and all was good again until I turned on the interior lights...poof again.

So I did something I normally wouldn't do...I put a 20A in. With a 20A fuse, I tried the fridge, then the porch light, and then the interior trio...everything worked.

I shut all 3 off, pulled the 20A fuse, and called it quits for the night.

Any ideas? I'm in a pickle since I leave out for Pensacola, FL on Wednesday morning.

Thanks in advance!
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Old 07-25-2016, 10:10 PM   #2
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Clearly you are overloading the system. How long is the extention from your home socket to the RV. If it's long there is a voltage drop and the amps get drawn more and hence you can blow fuses. Try a better quality thicker and shorter cable? Better still get a voltage regulator like a Hughes etc. Nothing works properly when you have bad power so invest in it anyway. It's a good call for prolonged life of everything.
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Old 07-25-2016, 10:19 PM   #3
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Change out the light bulbs for LED bulbs. They pull maybe 10-20% of what current the incandescence bulbs consume. That should relieve the circuit overload and you can go back to a 15a fuse.
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Old 07-25-2016, 10:24 PM   #4
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JMHO: I'd really look into getting the fridge it's own 12 volt power source and fuse , to have it on a shared circuit is a
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Old 07-25-2016, 10:47 PM   #5
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JMHO: I'd really look into getting the fridge it's own 12 volt power source and fuse , to have it on a shared circuit is a
This makes sense
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Old 07-25-2016, 11:09 PM   #6
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If it's long there is a voltage drop and the amps get drawn more and hence you can blow fuses.
Actually the lower the voltage the less current a light will use (Ohm's Law). The fridge draws a few very small amount of of DC current and is not tasking the circuit. I would say your most likely problem is you have a short in one of you lights or their switches. As it appears to have happened when the TT was moved I would expect that the short occurred during the move due to vibration. If you have a VOM try to isolate each light fixture and then check the resistance of each fixture to find the one with the short. Although it's a good idea to change out your bulbs to LEDs, this will not fix your problem unless one of the bulbs is the cause of the short.
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Old 07-25-2016, 11:44 PM   #7
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Actually the lower the voltage the less current a light will use (Ohm's Law). The fridge draws a few very small amount of of DC current and is not tasking the circuit. I would say your most likely problem is you have a short in one of you lights or their switches. As it appears to have happened when the TT was moved I would expect that the short occurred during the move due to vibration. If you have a VOM try to isolate each light fixture and then check the resistance of each fixture to find the one with the short. Although it's a good idea to change out your bulbs to LEDs, this will not fix your problem unless one of the bulbs is the cause of the short.
Not true.
P=I x V
If you lower the voltage the amps increase to compensate to keep the power the same as the unit will pull a certain power rating.

However, I do agree with your point about the short.
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Old 07-26-2016, 12:09 AM   #8
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Not true.
P=I x V
If you lower the voltage the amps increase to compensate to keep the power the same as the unit will pull a certain power rating.
A light bulb is not a motor. It is a simple resister that gets hot and emits visible light. When the voltage across a resister is lowered the amps drawn decrease. Ohm's Law has not changed in the 46 years that I have been a EE.
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Old 07-26-2016, 03:19 AM   #9
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A light bulb is not a motor. It is a simple resister that gets hot and emits visible light. When the voltage across a resister is lowered the amps drawn decrease. Ohm's Law has not changed in the 46 years that I have been a EE.

LOL. Im not talking about a light bulb, im talking about the fridge and its motor, when the voltage drops, the fridge wants to still pull the power to keep it going. 46 years as an EE
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Old 07-26-2016, 03:23 AM   #10
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The lights and fridge are on the same circut so that you see that a fuse blew. Swap the lamps with LED like the other person suggested


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Old 07-26-2016, 03:39 AM   #11
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Likely your bulbs are 21watt, 7 amp draw all on and as already stated by a previous poster the fridge draws a tiny amount, therfore 15amp fuse is fine as a rating.
You have a fault, a short somewhere and masking it with led bulbs or worse higher rated fuses is bad, as odh said, meter the fixtures, switches and if nothing the wiring and fix the fault.
Faults like this can be irritating at best or cause fires at worst!
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Old 07-26-2016, 07:02 AM   #12
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LOL. Im not talking about a light bulb, im talking about the fridge and its motor, when the voltage drops, the fridge wants to still pull the power to keep it going. 46 years as an EE
RV fridge does not have a motor. Before posting again try doing a little research.
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Old 07-26-2016, 07:22 AM   #13
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When you add up all those current draws you are apparently going over 15 amps and mentally that adds up. Those lights draw 2-2.5 amps each.

I totally agree that changing a couple of bulbs to led will solve the issue. If it is easy to move one of the circuits to another fuse location that might be a solution but if you are not electrically inclined I would not advise it.

Fuses running close to their full rating can blow easier. Not much of a fudge factor left. For example, hooking up to your vehicle may have increased the voltage just enough to cause the fuse to go. Any slight contamination in the fuse holder can cause heat to build up.

Since you tried a 20 and it did not blow it seems you are barely going over the 15 amps.

Led bulbs are getting to be very inexpensive. You can get them on E-bay or Superbrightleds is an excellent choice for the novice.
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Old 07-26-2016, 08:00 AM   #14
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Not any kind of an expert. As said you appear to be close to the fuse rate. I was thinking that if all was working for a while then quit. If you have a fridge that has fans on the back one of them may have given up on you. I would heckle them as well. ....Dusty
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