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Blows main fuse when I turn on the key?

  • Thread starter Thread starter PAC315
  • Start date Start date
Gumpster said:
...........

The owner installed a new battery and fuses and the problem seems to fixed. ....

..
Click to expand...

A new battery ?? Fixed the problem of blowing main fuse as soon as turn on ignition key...?

Just for fun... turn on ignition key, and try tapping on horn(s), then try tapping harder, see if that blows the main fuse.
 
Redman said:
A new battery ?? Fixed the problem of blowing main fuse as soon as turn on ignition key...?

Just for fun... turn on ignition key, and try tapping on horn(s), then try tapping harder, see if that blows the main fuse.
Click to expand...

We are going to completely check it out next week and will check the horn as well. This area gets really crazy this time of year due to the Georgia - Florida game so will have to wait till next week.
 
posplayr said:
Unplug the R/R and see if the fuse blowing still happens. If not replace the R/R. Preferably series R/R (e.g. SH-775)
Click to expand...
Funny how life works. I was reading through this thread today at work. Then on the way home my gs550e loses all electrical power as I'm cruising down the freeway. Pull to the shoulder and catch a whiff of burnt electronics. Check my fuses and sure enough the main fuse is opened. It's at 15 amp and I only had a10 amp spare. Pop it in and the bike comes back to life, I haul butt to the nearest autozone for some more fuses because I know I'm on borrowed time. 1 minute after getting 15 amp fuses and replacing it it blows again. Again on the side of the road I remember the above suggestion so I pulled the regulator connector and rode the rest of the 30 miles on the battery, but no blown fuses.
The old regulator has a brown goo dripping from it and stinks to high heaven. Moral of the story, don't discount the regulator.
 
Hey folks! Been kinda hectic lately, and this is the first time I have been able to get back about my fuse issue. I purchased a new battery as the old one would not hold a charge. I also purchased new fuses and replaced them all. I pulled the tank and looked at all my wires and found no obvious shorts. So, I put it all back together and the bike started right up w/o any issues or blown fuses. I even pressed the horn many times and actually held it down for about 15 seconds. No blown fuses. All other systems work fine. Per suggestion of GS member Gumpster, who has been a great help and reached out to offer me some suggestions and lots of electrical wisdom, I checked the voltage while off and with the bike on. Voltage off was 12.2, and running at about 1,000rpm, was 13.8. After a couple of rides about 15 miles each everything seems to be working fine. Although the rectifier is fairly hot to the touch, but not so hot it burns your hand. FYI, I always have the lights burning when I ride.

So, Gumpster & I figured it must have been an old and possibly sulfated battery causing my problems.
 
More info: on my second ride I noticed that my oil temp gauge was not working. I installed this about 11 years ago, and have no recollection of exactly where I got the power to run it. I still have to hunt this down as I like knowing what temp my oil is at, plus I like looking at gauges. So, possibly this might also be a contributing factor to my mysterious fuse blowing issue. Anyhow, with Gumpster?s help we?ll get to the bottom of this.

So, until we talk next, I ride with lots of extra fuses! And I will get that rectifier checked out soon, and make sure it is grounded properly too, just to make sure!

Later!
 
fbody_mike said:
Funny how life works. I was reading through this thread today at work. Then on the way home my gs550e loses all electrical power as I'm cruising down the freeway. Pull to the shoulder and catch a whiff of burnt electronics. Check my fuses and sure enough the main fuse is opened. It's at 15 amp and I only had a10 amp spare. Pop it in and the bike comes back to life, I haul butt to the nearest autozone for some more fuses because I know I'm on borrowed time. 1 minute after getting 15 amp fuses and replacing it it blows again. Again on the side of the road I remember the above suggestion so I pulled the regulator connector and rode the rest of the 30 miles on the battery, but no blown fuses.
The old regulator has a brown goo dripping from it and stinks to high heaven. Moral of the story, don't discount the regulator.
Click to expand...
Thanks for the field report.
 
Good to hear of improvment, but I think the cause of you fuse blowing still exisit, but for some reason just isnt as repeatable as it was.
Yah, carry some spare fuses with you.

If the horn(s) are suspect, I dont think operating the horn will aggravate the problem and make it reoccur. Tapping and rapping on the horn(s) will. Have key on and tap and rapp and bump the horns.




PAC315 said:
...........
..........................................Voltage off was 12.2, and running at about 1,000rpm, was 13.8. ..........................
Click to expand...

That seems fairly good. As a good check of your charging system also check battery voltage at about 4000 rpm.
(Although not really related to your fuse blowing problem).





PAC315 said:
More info: on my second ride I noticed that my oil temp gauge was not working. I installed this about 11 years ago,...............
...............
Click to expand...
Ah, maybe might find a wire disconnected hanging around somewhere. Or maybe it was a problem inside the temp guage that was shorting out but now has blow open.
 
I had an intermittent fuse blowing on my 850. Finally tracked it down to a horn rotated just right so the hot terminal would contact the mount under the right wind or vibration conditions. Usually would blow both the headlight and main fuse.
 
"...although the rectifier is fairly hot to the touch, but not so hot it burns your hand. FYI, I always have the lights burning when I ride.
So, Gumpster & I figured it must have been an old and possibly sulfated battery causing my problems."

highly unlikely that battery -good or bad - has anything to do with this. The r/r is happy to dump its excess if battery refuses it
 
tom203 said:
"...although the rectifier is fairly hot to the touch, but not so hot it burns your hand. FYI, I always have the lights burning when I ride.
So, Gumpster & I figured it must have been an old and possibly sulfated battery causing my problems."

highly unlikely that battery -good or bad - has anything to do with this. The r/r is happy to dump its excess if battery refuses it[/QUOTE
yea, I’m struggling to figure out what the difference would be . To a first approximation a bad battery with higher internal resistance (if the model is reciprical) would accept less current causing the r/r to dump more meaning less current through the main fuse.
Click to expand...
 
Redman, You were right! Went out this afternoon to start the bike, turned on the key, and the main fuse blew. So, per your suggestion I unhooked the horn, replaced the fuse and all worked fine. Went for a 30 mike ride with no issues

Thanks!
 
However, now the oil temp gauge is working? Strange for sure. Anyhow, I will keep muddling through this issue. Electrical gremlins are not my strong suite! But I?m stubborn and will eventually figure this out!

So, got a couple questions for ya. 1. What and where do you suggest I get a new horn from? 2. Think I should replace the oil temp gauge too? I just don?t trust it now plus the old one is fogged up and looks like the seal might be bad allowing moisture inside. Any suggestions on a oil temp gauge?

Thanks!
 
You can pick up a couple of horns (high and low) from OReilly's and connect them into the wiring using a relay. Do a search here as there are quite a few threads about it
 
PAC315 said:
However, now the oil temp gauge is working? Strange for sure. Anyhow, I will keep muddling through this issue. Electrical gremlins are not my strong suite! But I’m stubborn and will eventually figure this out!

So, got a couple questions for ya. 1. What and where do you suggest I get a new horn from? 2. Think I should replace the oil temp gauge too? I just don’t trust it now plus the old one is fogged up and looks like the seal might be bad allowing moisture inside. Any suggestions on a oil temp gauge?

Thanks!
Click to expand...


You should probably consider changing out that R?R especially if it is getting hot (over 120 degF). If it is a stock R/R it is the most likely culprit to failing stators and it is a matter of standard practice to replace them with an SH-775 or other series R/R (Compufire).
 
PAC315 said:
................... ............. I unhooked the horn, replaced the fuse and all worked fine. Went for a 30 mike ride with no issues
.
Click to expand...

Well, the problem had been intermittent (occur occasional, not all the time, everytime) so we dont absolutely know that was THE problem. If the problem does not reoccur in, say, three times as long as it might have happened before, then you could have a fair idea that could have been the problem. Try reconnecting the horn and see if it happens again right away, then WILL have a good idea that was the problem.

Easiest way to replace the horns are to find a stock set on ebay. Unless you want to take this opportunity to upgrade and install something else. About anything else will require some wiring for 2 reasons:1)bigger horns take more power and dont want that going thru the horn button so need to add a relay and more power wiring, 2) some horn are grounded thru thier mounting which is incompatable with the stock wiring.

I dont have any suggestion for you relative to your oil tmp gusge, other than I wonder if IT might be the cause of your problems of blowing fuses. Maybe leave horn disconnected and see how long you go without fuse blowing. If fuse does blow again and if also that is when the temp gauge quits working again... then maybe the oil temp guage is more the suspect.

.
 
Last edited:
Redman said:
Well, the problem had been intermittent (occur occasional, not all the time, everytime) so we dont absolutely know that was THE problem. If the problem does not reoccur in, say, three times as long as it might have happened before, then you could have a fair idea that could have been the problem. Try reconnecting the horn and see if it happens again right away, then WILL have a good idea that was the problem.

Easiest way to replace the horns are to find a stock set on ebay. Unless you want to take this opportunity to upgrade and install something else. About anything else will require some wiring for 2 reasons:1)bigger horns take more power and dont want that going thru the horn button so need to add a relay and more power wiring, 2) some horn are grounded thru thier mounting which is incompatable with the stock wiring.

I dont have any suggestion for you relative to your oil tmp gusge, other than I wonder if IT might be the cause of your problems of blowing fuses. Maybe leave horn disconnected and see how long you go without fuse blowing. If fuse does blow again and if also that is when the temp gauge quits working again... then maybe the oil temp guage is more the suspect.

.
Click to expand...
+1 Which is to say all options are still on the table.
 
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