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General Forums => The Mess Hall => Topic started by: aka-justin on March 17, 2013, 09:28:06 AM

Title: CB making the speedometer go crazy
Post by: aka-justin on March 17, 2013, 09:28:06 AM

I finally used that CB I bought months ago on my last trip a week ago. I noticed about 50% of the time I keyed up, the speedometer went coo coo - jumping all over. At one point, it jumped to the govenor speed making the whole thing buck.

Anyone seen this or do I need to sh17 can this radio? I'm using a small speedometer recalibrator by the PCM, but the CB and antenna wire are no where near.

Title: Re: CB making the speedometer go crazy
Post by: Jeffy on March 17, 2013, 11:52:34 AM

Strange,  maybe it's (RF) leaking into the calibrator.  I'd try shielding it (calibrator).

Title: Re: CB making the speedometer go crazy
Post by: sharpxmen on March 17, 2013, 12:09:40 PM

do you have the solenoids on the + wires to the CB. Soulds like it's sending HF thru the +12v somehow, could be that it has an internal problem.

Title: Re: CB making the speedometer go crazy
Post by: aw12345 on March 17, 2013, 02:19:20 PM

Wouldn't hurt to moive the wiring from the CB as far away as you can from anything speedo related and make sure the CB and the CB antenna have a good ground

Title: Re: CB making the speedometer go crazy
Post by: neale_rs on March 17, 2013, 02:55:36 PM

Suspect a voltage problem.  The gauges go crazy in my 2003 Neon whenever the battery is starting to go bad.

Title: Re: CB making the speedometer go crazy
Post by: aka-justin on March 17, 2013, 09:46:59 PM

Everything is seperate from the speedo recalibrator and the CB except the ground. I'll isolate the ground for the CB and try shielding the recalibrator if not - it'd be easy to.

(https://www.motomummy.com/images/products/speedodrd.jpg)

https://www.motomummy.com/chain-kits-with-steel-front-and-rear-sprocket/12-oclocklabs-speedodrd/