I am having some trouble trying to diagnose why the DC 15 AMP fuse keeps blowing. I have narrowed the issue down to the scare light switch in the garage. When that switch is turned on the fuse blows. Anyone have advice on how I can begin to resolve this issue?
FYI - We are brand new to RV'ing and have only owned this rig for less than a week. This switch was working when the survey was performed.
Thanks!
That sounds like a short in the line somewhere after the fuse. If you have a volt meter, you can unscrew the switch from the wall, and check the voltage at the switch, before you turn it on (should be 12vdc). Then, get to one of the light assemblies, pull that down, and using the ohm (resistance) selection in the meter, touch the leads to the positive and negative sides, with the switch off. This SHOULD give you no reading, if it does give you a reading, like 0.00 ohms, then you have a short somewhere. Repeat with the rest of the lights.
Now comes the PITA part. Remove all the lights the switch controls and try flipping the switch. If the fuse blows, you now have to find where the positive wire is bare (rubbed through is my guess) and touching the frame or chassis. If it doesn't, then one of the lights is suspect. Put each one in and try it again.
I know this method will blow several fuses, but it's an easier way to find out what is causing the short.
Now, I'm assuming the switch controls just lights and not something mechanical, or something else (what that might be, I'm sorry, but I couldn't tell you).
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