1988 Radio question


Information and questions on GL1500 Goldwings (1988-2000)
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kane67
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1988 Radio question

Post by kane67 » Mon Feb 12, 2018 4:40 am



Hi all,

I've been wondering for a while why radio seem to have difficulties to find radio stations, and sometimes works w/o problem.
And this is now at winter time, I keep my wing in garage tent.

Finally yesterday I noticed that when key is ACC or P position, radio has weak performance, will not find stations if searching... just rotates search frequency over and over. Pre set channel has "weak receiving".
But if I turn key to ON position (all powers on), if works perfect. It finds all stations with clear sound without any weak effect like bad frequency /reception...

What is different (for radio) when key is P / ACC or ON position? Where to start troubleshooting?
I think my wing is GL1500A, it has cabling for headsets, no cb system.

br, kane



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kane67
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Re: 1988 Radio question

Post by kane67 » Wed Feb 14, 2018 1:15 pm

still a mystery...
I measured supply voltage, in acc pos 13.6V and with ON pos it slowly drops to 11.6.

Here’s a video, when it goes worse it looses stereo signal and ST starts flicker... note the sound how it clears when powering on...




Found a problem that right side sound was cutting and by lifting main connector it was ok.
With soldering iron, I went through all right side speaker solder joints in the radio’s small connector board. Now it’s fixed.

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Erdeniz Umman
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Re: 1988 Radio question

Post by Erdeniz Umman » Wed Feb 14, 2018 2:30 pm

Also, you may want to clean the antenna connectors behind the unit and under the seat.

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Uncle Fester
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Re: 1988 Radio question

Post by Uncle Fester » Wed Feb 14, 2018 3:01 pm

X2 on the antenna connections, plus while you have it apart, use some Contact Cleaner on the power connection.
Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do.
So throw off the bowlines.
Sail away from the safe harbor.
Catch the trade winds in your sails.
Explore,
Dream,
Discover!

Mark Twain

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kane67
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Re: 1988 Radio question

Post by kane67 » Wed Feb 14, 2018 3:14 pm

Antenna connections are clean, I have new extension cable. All connector pins/surfaces are clean.

I just wonder what is different for radio (P, ACC <—> ON) that it does this? :roll:

And it does not do this right away, it may function 15-20 minutes before this behavior starts.
If battery related, why it works perfect by turning to ON position.
Last edited by kane67 on Wed Feb 14, 2018 3:20 pm, edited 1 time in total.

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Uncle Fester
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Re: 1988 Radio question

Post by Uncle Fester » Wed Feb 14, 2018 3:20 pm

It is POSSIBLE that the key switch is Gerri g dirty, corroded inside, so it is not sending power where it belongs in different key positions.
I am having the same basic issue with my bike in that with the key in RUN, I get no power to the running lights on it, but turn the key to where it locks the bars but leaves the remarry. I g lights on (for break downs at night) and the lights that are supposed to do light up then....
Associate. As my taxes get here, I am getting the switch replaced.
Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do.
So throw off the bowlines.
Sail away from the safe harbor.
Catch the trade winds in your sails.
Explore,
Dream,
Discover!

Mark Twain

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kane67
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Re: 1988 Radio question

Post by kane67 » Wed Feb 14, 2018 3:23 pm

Yep, could be.
I tried to read schematics to understand if power comes via relay to radio? Not sure...
If it’s different route when turning ON?

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Uncle Fester
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Re: 1988 Radio question

Post by Uncle Fester » Wed Feb 14, 2018 3:25 pm

That I do not know, sorry.someone who does know should be along sometime today. Good luck and keep us posted.
Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do.
So throw off the bowlines.
Sail away from the safe harbor.
Catch the trade winds in your sails.
Explore,
Dream,
Discover!

Mark Twain

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Erdeniz Umman
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Re: 1988 Radio question

Post by Erdeniz Umman » Wed Feb 14, 2018 3:25 pm

Any loose or corroded contact will create resistance which will drop the voltage and turn into heat. And this voltage drop seems more effective on the radio circuit than the other circuits on the PCB.

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MikeB
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Re: 1988 Radio question

Post by MikeB » Wed Feb 14, 2018 4:19 pm

The issue could have stemmed from a poor ground.

The green wire coming out of the radio wire harness needs to be grounded to the radio at one of the radio mounting ears. Take a look at the diagram below. It is from the CB radio installation instructions and it shows the ground wire and where it connects.

If you removed the radio during your repair work and then reinstalled it, you certainly removed the ground wire and then reconnected it and made a good ground in the process.

The issue you show in your video is not necessarily due to better positive power input from ACCESSORY or ON positions of the ignition switch. The radio senses grounds from many points and when you turn the ignition from ACC to ON, it may well be sensing a ground from somewhere else and giving the indication that there is better power input.

My money is on a poor ground connection.


MikeB
Tacoma, WA, USA

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kane67
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Re: 1988 Radio question

Post by kane67 » Wed Feb 14, 2018 10:59 pm

Well... I don’t have that grounding wire at all.
Only green from harness goes to connector. I will place an extra grounding wire from radio case to ground and see if that helps. Thanks Mike!

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Erdeniz Umman
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Re: 1988 Radio question

Post by Erdeniz Umman » Thu Feb 15, 2018 1:19 am

MikeB wrote:
Wed Feb 14, 2018 4:19 pm
The issue could have stemmed from a poor ground.

The green wire coming out of the radio wire harness needs to be grounded to the radio at one of the radio mounting ears. Take a look at the diagram below. It is from the CB radio installation instructions and it shows the ground wire and where it connects.
....

My money is on a poor ground connection.
radio ground.jpg
Although you may be right about a ground issue, that green wire is not available on EuroSpec bikes since the CB is not installed originally.



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