CREZZ Posted August 25, 2006 Report Share Posted August 25, 2006 Hello All , I keep getting an Excessive voltage alarm on my Navman 7100 dsc vhf radio when i have been running the engine harder than normal . Ploding round the harbour etc it works fine but when i give it a bit of welly after about 5 mins the alarm starts beeping . When the engine is throttled back and i turn radio off and on again it all works fine , Can any of you Electrical experts point me in the right direction please . The power to the radio runs straight from the battery to a fused switch box , and there is only one batttery on the boat . All fuses remain intact . At speed I also lose any signal from my fish finder as well , it's a hummingbird wide 100 , not sure if the two are related or the fish finder problem is one that has been discussed on another thread on the site . Any help will be greatly appreciated . Andy Quote Link to comment Share on other sites More sharing options...
Paul J Posted August 25, 2006 Report Share Posted August 25, 2006 Not an expert but is it the voltage regulater thats packed up and overcharging the battery? PJ Quote Link to comment Share on other sites More sharing options...
Newboy Posted August 25, 2006 Report Share Posted August 25, 2006 I had that when I had my 7100, then one of the battery packed up and after I replaced the battery, the 7100 was fine again. Quote Link to comment Share on other sites More sharing options...
Coddy Posted August 25, 2006 Report Share Posted August 25, 2006 (edited) Can I suggest that you take a battery voltage reading when being charged. Some F/F you can change the display to show the voltage, should be approx 14 volts max. Coddy Edited August 25, 2006 by Codfather Quote Link to comment Share on other sites More sharing options...
Bob F Posted August 25, 2006 Report Share Posted August 25, 2006 Andy Are you sure it's an Excessive voltage alarm, and not a low voltage alarm? I cannot find any reference to an Excessive voltage alarm on the Navman radio's. Does it actually come up with a message saying "excessive voltage", or do you just see a battery symbol? BF Quote Link to comment Share on other sites More sharing options...
CREZZ Posted August 26, 2006 Author Report Share Posted August 26, 2006 Hello Bob , Yes it is definately excessive voltage written in the bottom left hand side of the display , and the radio emits a loud beeping , i have scoured the manual as well and can't find anything related to this problem . I don't think it is a low voltage problem cos i can sit all day at anchor with fish finder and radio on and they both work fine and engine starts ok . Paul J's suggestion makes sense , if the voltage regulator on the engine is iffy i presume the more welly you give the engine the more voltage is sent to the battery and this is transferred on up to the radio , i think . I'm not that good with electrical things so i might have that last bit all wrong . Andy Quote Link to comment Share on other sites More sharing options...
Bob F Posted August 26, 2006 Report Share Posted August 26, 2006 Andy I was trying to establish at which voltage the Excessive Voltage alarm sounds. This could help determine if you have a bad voltage regulator or a duff battery, and remove the need to conntect a volt meter. As Dave suggests, you need to connect a Volt meter between your 12V terminal and Ground, and monitor the voltage. When the engine is turned off the voltage should be between 11.5V and upto 13.8V for a fully charged battery. If the voltage is below 11.5V you probably have a duff battery and the alternator is trying to compensate for a bad cell in the battery and is causing the Excessive Voltage alarm (as happened with Kam). When the engine is running this voltage should increase to something between 13.8 to 14.4V. If the voltage is higher than this you probably have a duff voltage regulator. What type of engine do you have? Try taking some voltage readings with the engine running at tick over and when you are giving it some wellie. And again when the engine is off. Let us know the results. If you don't have a voltage meter, try replacing the battery, at least temporarily to see if it cures the problem. One other thing, do you have any other battery charging kit on your boat, like a solar panel? Make sure this has not been left connected when running your engine. cheers BF Quote Link to comment Share on other sites More sharing options...
CREZZ Posted August 26, 2006 Author Report Share Posted August 26, 2006 Thanks Bob , The engine is a 1989 25hp Yamaha 2 stroke , she's getting on a bit but seems to plod on nicely all the same . There is no other charging kit on the boat . I will go on the scrounge for a volt meter and see what shows up . In fact i will go on the scrounge now . Charlie Annear !! give us a go with your volt meter me old mate . Thanks again all , for your help . Andy . Quote Link to comment Share on other sites More sharing options...
Newboy Posted August 26, 2006 Report Share Posted August 26, 2006 Do you have a fishfinder, if you dom does it have a voltage function? Quote Link to comment Share on other sites More sharing options...
charlieannear Posted August 26, 2006 Report Share Posted August 26, 2006 Mate, pop over whenever you want and collect my multimeter. C. Quote Link to comment Share on other sites More sharing options...
Brian Posted August 26, 2006 Report Share Posted August 26, 2006 Doesn't the Hummingbird FF have a volt meter function? Quote Link to comment Share on other sites More sharing options...
Coddy Posted August 26, 2006 Report Share Posted August 26, 2006 Hi Have a look on this site for manuals Hummingbird Manuals Coddy Quote Link to comment Share on other sites More sharing options...
CREZZ Posted August 27, 2006 Author Report Share Posted August 27, 2006 Thanks Coddy , By the look of it the ff has no volt meter function on it , but i will have a play around with it next time i'm out . Andy . Quote Link to comment Share on other sites More sharing options...
CREZZ Posted September 3, 2006 Author Report Share Posted September 3, 2006 Hello All , I managed to take some voltage readings this morning , the engine was fired up on the drive with the flush muffs on . Engine off 12.51 volts Tick over 1100 rpm 13.6 volts 2500 rpm 15.1 volts 4500 rpm 16.1 volts I think it looks as though my voltage regulator is knackered , does anyone else agree ? Thanks again for the help . Andy Quote Link to comment Share on other sites More sharing options...
hotshot Posted September 3, 2006 Report Share Posted September 3, 2006 I think it looks as though my voltage regulator is knackered It certainly looks that way Regards, Dave. Quote Link to comment Share on other sites More sharing options...
duncan Posted September 3, 2006 Report Share Posted September 3, 2006 voltage regulator kaput! Quote Link to comment Share on other sites More sharing options...
charlieannear Posted September 3, 2006 Report Share Posted September 3, 2006 Andy, I found these people the other day: Outboard Spares C. Quote Link to comment Share on other sites More sharing options...
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