Electrical question????? - Page 2 - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-14-2012, 05:24 PM   #15
Senior Member
 
cpaharley2008's Avatar
 
Name: jim
Trailer: 2016 2ndGen Escape19 Prairie Schooner pulled by 2014 Dodge Ram Hemi Sport
Pennsylvania
Posts: 6,398
Registry
All I have is a plug looks like the 12v plug but has a 9v label on it, no special electronics.
__________________

__________________
cpaharley2008 is offline   Reply With Quote
Old 08-14-2012, 05:25 PM   #16
Senior Member
 
cpaharley2008's Avatar
 
Name: jim
Trailer: 2016 2ndGen Escape19 Prairie Schooner pulled by 2014 Dodge Ram Hemi Sport
Pennsylvania
Posts: 6,398
Registry
ok, I'll keep them separate, thanks
__________________

__________________
cpaharley2008 is offline   Reply With Quote
Old 08-14-2012, 05:47 PM   #17
Raz
Senior Member
 
Raz's Avatar
 
Name: Raz
Trailer: Trillium 2010
Vermont
Posts: 4,058
I have never seen a cigarette lighter type plug used for any voltage except 12VDC input. Usually the center pin is positive but I have found that switched. On the other end anything goes. That is, center can be positive or negative. For voltages lower than 12v they could have a simple voltage divider (resistors) for a dedicated adapter or a switcher like David suggests. One way to tell is to put an AM radio next to it. Any switching electronics will produce all kinds of harmonics which will radiate for a short distance. It's good to know as they can interfere not just with radios but computers, cell phones, GPS receivers, ect. . Raz
__________________
Raz is offline   Reply With Quote
Old 08-14-2012, 05:50 PM   #18
Senior Member
 
Ed Harris's Avatar
 
Name: Ed
Trailer: 1982 Fiber Stream and 2002 Casita Freedom Deluxe,The driveway is a Dark & Lonely Place now!
Missouri
Posts: 1,776
I have a few adapters that plug into a 12vdc lighter socket and then the output voltage is switchable to match various devices. Further there are several adapters to match the different device inputs and they can be turned too for polarity observation.

There are lots of times where you will want to connect a non-12vdc device to 12vdc in an RV.
__________________
Ed Harris is offline   Reply With Quote
Old 08-14-2012, 06:11 PM   #19
Senior Member
 
cpaharley2008's Avatar
 
Name: jim
Trailer: 2016 2ndGen Escape19 Prairie Schooner pulled by 2014 Dodge Ram Hemi Sport
Pennsylvania
Posts: 6,398
Registry
I'll try to post some pictures later...got dinner on stove
__________________
cpaharley2008 is offline   Reply With Quote
Old 08-14-2012, 08:42 PM   #20
Senior Member
 
Name: Eric
Trailer: Scamp 13
Michigan
Posts: 255
Sounds like good advice being given so far. A few comments:
1. Devices that should run on 12V should be run on 12V and not 9V or most other voltages.
2. Current expressed in Amps or mA (a 1000mA is 1Amp is 1A) on the power supply needs to be equal or greater than the maximum of the device that is using the power.
3. Polarity is important with DC circuits! I always check it. I have devices that look identical except for the label that tells you what is + and -. Note that you can always switch the polarity around if you are handy with cutting stripping and reconnecting wires.
4. If you understand the supply and the device being powered well enough, you can mix supply/device voltages without harm (hooking 12V or 9V supplies to 9V or 12V devices in random combinations for example). However, generally this information is not easily available so you run a notable risk in doing so and should generally "not be tried at home". But I have been known to tear things apart just to find out .
5. Switching power supplies are generally nosier than linear power supplies and can interfere with other electronics (GPS, radios....). The AM/FM radio test is useful. If it fails that test, it is a cheap/poorly designed power supply. Realize even if it passes you may have trouble with other devices (GPS...). However, well designed ones do not cause these issues. For example, automakers put numerous switching power supplies in cars with and without shielding and typically test very thoroughly to make sure there are no issues.
6. I agree with Ed that a set of adapters and various voltages can be useful. I have used those also.
__________________

__________________
ericw is offline   Reply With Quote
Reply

Tags
electrical


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Electrical Question Rocker Problem Solving | Owners Helping Owners 10 04-27-2012 11:53 PM
Electrical Question Ralefan46 Electrical | Charging, Systems, Solar and Generators 33 12-09-2011 04:19 PM
Battery Electrical Question Michael Knelsen Problem Solving | Owners Helping Owners 0 08-09-2008 01:46 PM
Electrical Question Dave Mac Electrical | Charging, Systems, Solar and Generators 14 08-10-2007 11:42 AM
electrical question stan s. Problem Solving | Owners Helping Owners 2 08-10-2006 11:25 AM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:37 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.