276c Antenna connect issue

Discussion in 'Mapping & Navigation' started by Solo Lobo, Jul 3, 2013.

  1. Solo Lobo

    Solo Lobo airhead or nothing

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    My older 276c was having issues picking up satelites with the stock antenna that is original to the GPS.

    I picked up a Glisson external that, when it is working, picks up 12+ satelites where the stock antenna at best did 4-5

    To get either to work, I have to repossion the antena (or cable), wait to see if any satelites are found and possibly move it again if none are found (which is normal and I have to try 4-5 positionings).

    I'd have to conclude that something on the GPS side is the issue here.

    Any words of wisdom about adressing this type of fault?

    Sadly I had been planning on send in my 276c to Garmin for a refresh, and see I waited a bit too long... they don't reman these anymore
    #1
  2. 9Dave

    9Dave Bazinga!

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    Have you ever replaced the internal battery that powers the memory? That stores info on satellites. If the battery goes bad, it takes forever for the unit to power up, find satellites, etc.

    Doesn't sound like the classic bad battery issue, but you never know.
    #2
  3. Solo Lobo

    Solo Lobo airhead or nothing

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    Thanks for the reply... I have my 276 hardwired into my bike and it never is off the battery for more than say hours.

    Even unplugged it fire up pretty fast.
    #3
  4. BlueLghtning

    BlueLghtning Riding is my passion

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    The normal operating battery has nothing to do with the "internal" battery that remembers the date/time sat info.

    Even if the GPS stays plugged in and the operating battery good, if the internal battery is bad, when you shut off the GPS for extended periods of time (days to weeks), it forgets all the sat info and has to basically "cold boot" and reinitialize every time.

    It's easy to check and see if the date/time when you boot it up is way off. Then you know you have a dead internal battery.
    #4
  5. Solo Lobo

    Solo Lobo airhead or nothing

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    I get it now, and yes the clock has been way wrong in the recent past when starting up....

    Off to google internal battery replacement. I'll update once I get this done and test.

    Thanks for posting!
    #5
  6. NorthernTraveler

    NorthernTraveler Long time Adventurer

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    There is a thread around here that shows you step by step how to replace the internal battery on a 276c.

    I think Big Dog put it up, but could be wrong.

    Oh, and just a note - you might not want to disconnect the screen to make it easier to work with. The tutorial doesn't talk about this, but if you do you could have big problems.... don't ask me how I know!
    #6
  7. Solo Lobo

    Solo Lobo airhead or nothing

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    Thanks!

    I have the battery on order, and replaced one on my old 176C years ago!
    #7
  8. Solo Lobo

    Solo Lobo airhead or nothing

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    Well, the GPS clock showed the (very) wrong time again today.. good thing I have a new internal battery headed my way
    #8
  9. Uller

    Uller Long timer

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    I experienced the same/similar thing. I had tried to mount the external antenna on my handlebars then on a bracket I made and found that it wouldn't lock on a signal. I found that if I removed the antenna from the bike it worked flawlessly. I now mount the antenna on the top of my front fender and it works great.

    My theory is that the Glisson Antenna grounds out or something similar and stops it from locking on the signal.

    I didn't know they won't refurb the 276 anymore. Majorly bummed about that one........:cry
    #9
  10. Solo Lobo

    Solo Lobo airhead or nothing

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    Update:

    So I replaced the internal battery which helped, but I still have an issue and am certain that my antenna is not making a proper connection with the GPS unit.

    If I move the antenna connector around I can hit a "sweet spot" and will get 7+ satellites right away... ride some more an they drop.

    Initially I bent both the external and internal tabs on the GPS unit to tighten up the connection and that worked for one ride... now the problem is back again today.

    Has anyone replaced in the GPS unit antenna connection? Does anyone know of any companies repairing/reman'ing 276c's?
    #10
  11. 9Dave

    9Dave Bazinga!

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    There is a thread in here somewhere about a company that provides some GPS repairs. Don't know if the antenna connection is one of them.

    Garmin doesn't sell the parts, but the antenna connector is a standard connector. Looking at Digikey, etc. might give you a source for a similar one.
    #11
  12. halfcab

    halfcab Been here awhile

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    On one of my KTM's I'm using a Glisson with the 276C. At one time I was also thinking the antenna connector on the 276 was bad.

    Make sure the antenna connector adapter on the Giisson wire lead is tight. At first it was only hand tight and had proublems, when I use two wrenches to do so. Bingo, now no problems.

    Hope this helps.
    #12
  13. Solo Lobo

    Solo Lobo airhead or nothing

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    I'll take a look tonight, thanks!
    #13
  14. caver

    caver Missouri The Cave State

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    I had the same problem with an older Gilsson antennae and Garmin 276C
    It was either on their website or I emailed them about it??? The center wire on the Gilsson BNC connecter was slightly smaller than the Garmin hence the intermittent connections. This was a few years ago. I've since sold the 276C. At the time the 276C was the only BNC model they didn't recommend it for. It worked fine on the older 176
    #14
  15. Solo Lobo

    Solo Lobo airhead or nothing

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    I had a Glisson before the one I have now that worked great for years... I will be shimming the internal connection point for the Gisson wire connection to see what that does.
    #15
  16. Solo Lobo

    Solo Lobo airhead or nothing

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    Just to bump this back to the top, I can say with absolute cetainty that there is some issue with my antenna connection.

    When hitting bumps all sat's drop, and then if I wiggle the connection they come back... but only if I get the connector in the right spot.

    Is there any way to replace/rehab the antenna connector on the GPS unit?
    #16
  17. BlueLghtning

    BlueLghtning Riding is my passion

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    I've never done anything other then just bend the tabs to make the connection tighter which it sounded like you did, but didn't last long.

    I'm not sure which mount you have, but does your antenna stay straight up or flop over to the side? The TT mounts keep the antenna straight up which is where it picks up the best signal. I found that I was having to adjust the tabs on my antenna a lot so a started just using electrical tape to keep the antenna straight up and now I get much better signal and it doesn't need adjusting at all.

    Granted you might have another issue with the contacts? You could always try just getting a new antenna? What about an external antenna? Do you have room and does your GPS always stay on that bike?
    #17
  18. Solo Lobo

    Solo Lobo airhead or nothing

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    Thanks for the reply,

    I have this issue with both the stock antenna and the Glisson. I've tried the bending tabs trick and it didn't help.

    I'm guessing that the internal GPS connection for the antenna wire is worn... I'm not having much success in finding a place to repair this part
    #18
  19. BlueLghtning

    BlueLghtning Riding is my passion

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    Yeah, if you are having that much issue, probably internal.

    Have you tried pulling the GPS apart just to visually inspect and see?

    The thread about replacing the internal battery should have the instructions on pulling it apart.
    #19
  20. Solo Lobo

    Solo Lobo airhead or nothing

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    That's my next step I think... the connectors are readily available its the soldering that has me a bit worried
    #20