12 volt issue in bathroom

[ricko]

I was replacing 12 volt fluorescent tube lights 12” in bathroom. Using a multi meter and caused a spark. Now the bathroom lights won’t work. I finished the swap to led but still no lights. Checked the 12 volt fuse for the bathroom and it was good but replaced anyway. All other lights in coach are working fine. Any ideas? This issue is in a holiday rambler admiral se 34 SBD. 

Edited December 30, 2021 by ricko

[frank.bergamo]

Check the GFI receptacle in the bathroom to make sure it is not tripped. Check any other GFI’s also. Hope this helps.

Just reread original post, GFI’s control AC, not 12 volt DC. Sorry about that.

Edited December 30, 2021 by frank.bergamo

[rossboyer]

Are there any other 12vdc devices on the same circuit? Maybe exhaust fan? If so, are they working? Maybe a loose connection in that circuit that opened due to the accidental short. 

[kaypsmith]

Check for 12 volts at the place where the led's are connected, if present, then reverse the leads to the led. Led will not light if wired backwards.

[rossboyer]

This is very true. I installed three led lights. One had the color of wires reversed from the other two. 

[hermanmullins]

I may be wrong but aren't fluorescent bulbs 110 volt a/c? 

Herman

[rossboyer]

Yes, they are 120vac, but most RV fluorescent fixtures convert 12vdc to 120vac to be compatible with standard fluorescent light bulbs. 

[kaypsmith]

I wonder if ricko ever found the solution to making his LED light dilemma work. Here is a pretty good discussion on what makes a florescent light operate. https://ludens.cl/Electron/Fluolamp/fluolamp.html Florescent is an interesting concept, unlike LED (light emitting diode) which requires direct current, florescent requires pulsating (alternating current), it requires a converter to change DC to AC, while an electronic TV requires a converter to change AC to DC. A florescent bulb requires 100 to 10,000 volts AC. An old style TV, CRT (cathode ray tube) required 5,000 to 37,000 volts to light the CRT, depending on color that was to be produced. An LED only requires about 4 volts DC, and very low current.