RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 04-07-2017, 01:38 PM   #1
Junior Member
 
Tuc RV's Avatar
 
Join Date: Apr 2017
Posts: 7
Radio upgrade issue

I have a 1995 Itasca Sunrise 23R (class A) and am looking to upgrade the factory Audiovox am/fm/cassette dash radio. The radio is easily accessible for replacement but I'm having problems with the wiring and existing wiring harness. Apparently when the RV was manufactured by Winnebago it utilized a "constant" ground as opposed to the current industry standard of a "flowing" ground. This apparently effects not only the radio head unit but also the speakers. Has anyone else run into this problem and if so were you able to get it resolved?
Tuc RV is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 04-07-2017, 06:52 PM   #2
Senior Member
 
Join Date: Sep 2012
Posts: 8,055
I'd like to know the difference in the grounds. Over 50 years of working and playing with electronics and this is a new idea to me. Ground has always been ground. In AC systems there is ground and neutral but DC does not have that distinction as far as I know.
nothermark is offline   Reply With Quote
Old 04-07-2017, 06:58 PM   #3
Senior Member
 
Sammie's Avatar
 
Tiffin Owners Club
Join Date: Jun 2006
Location: Southern California
Posts: 1,802
Hi Tuc RV,
Sorry but I think somebodys blowing smoke. Ground is Ground. Not a big mystery there.

Sammie
__________________
2015 Tiffin Bus 37AP
2016 Ford Explorer
"A Job Begun is Half Done"
Sammie is offline   Reply With Quote
Old 04-07-2017, 07:37 PM   #4
Senior Member
 
brokenrule's Avatar
 
Join Date: Jun 2016
Posts: 377
I used to have a car stereo business and the first motorhome I installed a radio in went perfect until they went to leave a 4 am... at 4:10 i got a call. When they turned on the headlights it blew out the radio and dash lights. Seams what was a ground was only a ground when the lights were off. When the lights came on the ground was variable to dim the lights to the factory radio. That might be what they are calling a floating ground. Some might call an isolated ground incorrectly a floating ground. If you are doing your own install then just double check the factory harness with and without the lights on and off. Best of luck.
__________________
2013 Tiffin Alegro 32CA
1996 Itasca Suncruiser 29RQ, 7.4, P32
brokenrule is offline   Reply With Quote
Old 04-08-2017, 09:39 AM   #5
Senior Member
 
Join Date: Sep 2012
Posts: 8,055
That is not a ground then. It is a negative return lead that happened to be at ground when the lights were off. Probably was a few ohms. The automotive industry likes to feed power to one side and control the return lead. I am not sure why but I suspect it may be safer or help with noise. I can easily see a dimmer in the circuit and probing around for a ground mistaking the negative return for a ground. I'm not sure what the resistance of a dimmer is but it cannot be very high at 12 V and controlling an amp or so of lights.

It sounds like anyone adding anything in an automotive dash system should run grounds direct to the chassis metal or negative battery lead. I'd guess they wanted the radio lights to go to the hot side of the dimmer resistor so the radio lights would dim with the dash lights. There is probably a provision for that in the harness to the radio.
nothermark is offline   Reply With Quote
Old 04-08-2017, 11:05 AM   #6
Junior Member
 
Tuc RV's Avatar
 
Join Date: Apr 2017
Posts: 7
Thanks for the various insights. I did some additional checking and found that all 4 speakers (RLFB) are wired with identical green and purple leads. I also found that there are only green and purple leads (6 and 6) entering the harness from the vehicle side then breaking down into the Audiovox harness. I suspect I'll be taking this to a reputable audio shop for an assessment and necessary work. So much for an easy plug and play upgrade.
Tuc RV is offline   Reply With Quote
Old 04-08-2017, 11:30 AM   #7
Senior Member
 
Hgrace56's Avatar
 
Join Date: Jan 2016
Location: Northridge, CA
Posts: 1,218
Years ago on extremely cheap installations only the + was wired to the speakers. The - was simply grounded to the chassis.
This did not provide for optimal fidelity but did work.
This might be the odd grounding convention referred to
__________________
Harry Grace
KM6ZRG
Hgrace56 is offline   Reply With Quote
Old 04-08-2017, 01:13 PM   #8
Senior Member
 
brokenrule's Avatar
 
Join Date: Jun 2016
Posts: 377
Sounds like the six wires in the harness are four for the speakers and then power and ground. From there just take a AA battery across the speaker leads and they will make a pop when you just momentarily tap the wire to the battery. Let say you pick the purple wire to go to the AA battery positive and then see the speaker go out then you have purple as speaker positive. That is how I used to do it way back when. I closed my business down when they started putting the radio controls on the steering wheel... that kind of date me.
__________________
2013 Tiffin Alegro 32CA
1996 Itasca Suncruiser 29RQ, 7.4, P32
brokenrule is offline   Reply With Quote
Reply

Tags
radio, upgrade



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
SeriusXM Satellite Radio - adapter to built in radio or standalone radio? vsheetz Technology: Internet, TV, Satellite, Cell Phones, etc. 9 04-02-2017 09:33 AM
TV Upgrade and Battery Upgrade - Itasca Sunrise FrankO Winnebago Industries Owner's Forum 15 12-28-2016 04:37 PM
ccc upgrade/axle upgrade? zacktown Monaco Owner's Forum 18 08-07-2012 07:57 AM
battery isolator upgrade / alternator upgrade boomvan Vintage RV's 10 03-15-2012 02:50 AM
Southwind 36D Issue after issue after issue.... fixn2gocamp Fleetwood Owner's Forum 4 10-21-2009 08:05 PM


All times are GMT -6. The time now is 02:27 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.