CB Feedback from adjusting mirrors and something in HVAC...

Cbohl51 · 04-21-2009, 02:24 PM

I installed a Cobra 18WXSTII over the weekend, and it works great minus 2 things.

First, something in the HVAC system (sounds like a vent closing or something of that nature) is causing feed back at times. I'm not sure exactly what it is, as I heard the noise of whatever before and wondered what it was, but now with the CB, when it goes, it creates horrible feedback.

Also, when adjusting the mirrors, I also get horrible feedback. My ground wire is up around the E-Brake handle on a 3rd gen 4runner. This mounts directly to the body, and has been sanded for metal to metal contact.

The CB coax to the antenna runs under the pedals and into the engine bay, then down the underside of the car.

Does anyone else with a 3rd Gen 4Runner get this feed back with their CBs and if so, any way to fix?

Thanks for any suggestions!

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4Crawler · 04-21-2009, 02:27 PM

Might try a different ground wire location. On my '85, I ran power and ground wires directly from the engine fuse box up front back to the CB for the cleanest signal:
- http://www.4crawler.com/4x4/CheapTri...na.shtml#Power

**aviator** · 04-21-2009, 10:21 PM

Sounds like a ground problem to me to...

eric-the-red · 04-22-2009, 01:43 PM

I have my CB grounded directly to the battery, along with the power wire and I also get bad interference from the power mirrors. My antenna is on the passenger side fender so the coax runs from the centre console behind the glove box and through the firewall. I've never had any problems from the heater/Ac system though.

I've never tried to fix the mirror issue, I don't move them very often so I just live with it.

**aviator** · 04-22-2009, 11:45 PM

Eric you may find that the mirrors have a poor ground and may be causing a dirty return back to the batt. not that it would be a major issue in any case...
if signal noise continues to be an issue there are electronic boxes you can set on the power and ant. lines of stereos and I believe they are available for comms. radios too.

Cbohl51 · 04-23-2009, 09:39 AM

Thanks for the input!!

I will run power and ground outside of the cabin and see what happens!

eric-the-red · 04-23-2009, 12:33 PM

Quote:

Originally Posted by aviator

Eric you may find that the mirrors have a poor ground and may be causing a dirty return back to the batt. not that it would be a major issue in any case...
if signal noise continues to be an issue there are electronic boxes you can set on the power and ant. lines of stereos and I believe they are available for comms. radios too.

One day I may look into it, I'm sure on a 9 year old vehicle a lot of the grounds could do with cleaning up. But I only ever move the mirrors when I'm offroad and want to see the where the rear tires are going so I can live with a bit of noise. It only affects my CB, the ham radio doesn't have a problem, neither on VHF nor UHF.

04-21-2009, 02:27 PM	#2 (permalink)
4Crawler Contributing Member Join Date: Jun 2002 Location: SF Bay Area, CA Posts: 7,832	Might try a different ground wire location. On my '85, I ran power and ground wires directly from the engine fuse box up front back to the CB for the cleanest signal: - http://www.4crawler.com/4x4/CheapTri...na.shtml#Power __________________ 1985 Toyota 4Runner SR-5, 22REC engine, dual t-cases, 4.88 gears, dual ARBs, 33x10.50 BFGs or 35x12.50 MTRs r.c.brown@ieee.org TruckEditor@tlca.org Project: 4Crawler 4Crawler OffRoad Gettin'Off 4WD Club

04-21-2009, 10:21 PM	#3 (permalink)
aviator Super Moderator Staff Join Date: Mar 2003 Location: COTKU,Ontario,Canada Posts: 7,472	Sounds like a ground problem to me to... __________________ Silver 1994 Hilux Xtra cab 4x4 3.0 K&N cone filter, ported MAF, advanced timing, oversize exhaust, free flow cat, "rumble" muffler custom covered SR5 seats, map lights, factory AC tv4184 style black interior conversion started mods to come... header, custom centre console, stereo upgrade tinted windows Founding member 1972TLC fan club - Get well soon Mary Toyota Hilux... Get in or Get out of the way.

04-22-2009, 01:43 PM	#4 (permalink)
eric-the-red Contributing Member Join Date: Oct 2003 Location: Port Coquitlam, BC Posts: 2,493	I have my CB grounded directly to the battery, along with the power wire and I also get bad interference from the power mirrors. My antenna is on the passenger side fender so the coax runs from the centre console behind the glove box and through the firewall. I've never had any problems from the heater/Ac system though. I've never tried to fix the mirror issue, I don't move them very often so I just live with it. __________________ 2001 4Runner 4.30 ratio 1999 e-locked rear axle and front diff; OME881/N91S front; OME891/N86 rear; Tundra brake swap; 1" 4Crawler body lift; 63" 4Crawler SliderZ; TJM T-15 with Warn M8000 winch and Amsteel blue synthetic line; 265/75R16 Nitto TGs or 255/85R16 Truxs MTs; Cobra 75 WX ST cb; Alinco DR635 VHF/UHF ham radio; ham call sign license plates - VE7 EGC

04-22-2009, 11:45 PM	#5 (permalink)
aviator Super Moderator Staff Join Date: Mar 2003 Location: COTKU,Ontario,Canada Posts: 7,472	Eric you may find that the mirrors have a poor ground and may be causing a dirty return back to the batt. not that it would be a major issue in any case... if signal noise continues to be an issue there are electronic boxes you can set on the power and ant. lines of stereos and I believe they are available for comms. radios too. __________________ Silver 1994 Hilux Xtra cab 4x4 3.0 K&N cone filter, ported MAF, advanced timing, oversize exhaust, free flow cat, "rumble" muffler custom covered SR5 seats, map lights, factory AC tv4184 style black interior conversion started mods to come... header, custom centre console, stereo upgrade tinted windows Founding member 1972TLC fan club - Get well soon Mary Toyota Hilux... Get in or Get out of the way.

04-23-2009, 09:39 AM	#6 (permalink)
Cbohl51 Registered User Join Date: May 2007 Location: Lexington, KY Posts: 70	Thanks for the input!! I will run power and ground outside of the cabin and see what happens! __________________ 2001 4Runner Limited 4wd(Black Pearl Emblems) - - Thundercloud Metallic Eclipse AVN6620 - - Eclipse SC8264 - - Eclipse 89640 Cobra 18wxstii w/ 5' Wilson antenna Husky Floor Mats & Cargo Liner Hunter Bull Bar & Piaa 510 Ion Fogs 99 Tall springs w/ Bilstein HDs, ploy steering bushings and anti-sway kit Bye Bye Running boards and roof rack!

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