Author Topic: Main fuse keeps blowing (Read 26160 times)

emmaus777 · « **Reply #50 on:** July 14, 2006, 09:28:16 AM »

I'm about 98% posative that the starter switch is the problem. I opened it up and the solders were very pour. The actual switch was broken as well, the whole thing blew up and fell apart when I attempted to remove it. Now my question is, where do i aquire a new one?
Again, thanks for all your help.
Robb

TwoTired · « **Reply #51 on:** July 14, 2006, 09:40:16 AM »

To my knowledge, there is no source of parts internal to the bar control groups. Honda only offered the entire control position. And, some people need smelling salts after learning the asking price.

It is possible to rob the parts from another pod. I've also rebuilt the switch plastic with super glue. But, it's a skill not everyone acquires easily.

If your local honda dealer or motorcycle breakers won't give you satisfaction, you can try David Silver Spares in the UK.

Cheers,

Cvillechopper · « **Reply #52 on:** July 14, 2006, 09:40:32 AM »

Let me know if you find somewhere that sells just the switch. My friend's bike has a bad switch but he doesn't want to replace the entire housing.

emmaus777 · « **Reply #53 on:** July 14, 2006, 10:40:12 AM »

I would love to try and put it back together, but the whole thing fell apart onto the floor. So I'm not even sure if I have all the pieces. Can anyone tell me how it goes together or show me a picture or something?
Thanks, Robb

kraftradfahrer · « **Reply #54 on:** August 25, 2006, 03:49:37 PM »

If I have the head light on, turn-signal on, and brakes engaged all at once, and for too long, the main fuse disintegrates. Any ideas? Alternator overcharge perhaps?

Ernie · « **Reply #55 on:** August 25, 2006, 04:52:18 PM »

i would start tracking down bad connections and cleaning grounds

oldbiker · « **Reply #56 on:** August 26, 2006, 01:19:28 AM »

Also check the condition of the fuse contacts. A bad connection here can build up enough heat to blow the fuse or even melt the plastic of the fusebox itself.

jasonbox · « **Reply #57 on:** August 26, 2006, 06:30:02 AM »

I've had similar problems, lived with it for years until I took the time to find the short circuit.

cleaning fuse teminals can help...

but the problem is most likely solved by finding where a hot wire(s) is going to ground on the bike where is shouldn't...

I found my short along the right-hand grip/starter button wires. A wire had somehow been pinched or worn so the insulation was absent in a critical place, copper wire was in minor contact with the handle bar. That was it, and easy to fix with electrical tape.

The lights were brighter after the fix, well worth the meticulous search, and you will learn about the electrical as a by-product of the search.

Don't be afraid to remove ALL the electrical tape over the wiring harness. I found and repaired several suspicious wires.

Replacing the wiring harness MIGHT be an alternative fix, but who knows if the one you buy is in better condition, unless it is new, but that is a rare find.

JBOX

kraftradfahrer · « **Reply #58 on:** August 26, 2006, 10:09:55 AM »

Thank you all, for your suggestions!

canyon750 · « **Reply #59 on:** August 26, 2006, 11:52:37 AM »

Definitely check out the fuse box. These bikes all have questionable fuse boxes. I replaced mine with a modern blade style fuse box and all my fuse blowing and fuse box melting went away. Plus, check for loose connectors. I had my shop order the Honda wire crimper ($65!!!!) and straight from Japan wiring terminals that are a perfect fit to the Honda wiring harness. These have a nice tight fit.

kraftradfahrer · « **Reply #60 on:** August 26, 2006, 12:01:03 PM »

hmmm... not a bad idea. I have a difficult time finding those seemingly rare AGX size glass 15amp fuses anyway. The blades would be easier to find. Good tip!

Rushoid · « **Reply #61 on:** September 22, 2006, 08:50:34 AM »

Hey guys,
Twice in the last couple of weeks I've blown a main fuse when making a right turn. I'm not sure if it happens when I'm braking or actually turning because I don't notice it until I try to accelerate and nothing happens. I have the hi-beam on (always in the daytime), right turn signal, and brake light (until 1/2 way through the turn anyway). I pop a new fuse in and I'm on my merry way with everthing working. I know the things I need to look for, I'm just wondering where to start. My fuse box looks good and i went through most of the wiring this past spring when I was trying to get it running (cleaned connectors, made sure everything was secure but not too tight). I just hate getting neck-deep into a problem only to find out I should have started at the other end first.

As an aside, does anybody have a photo of what the rat's nest in the headlight bucket is supposed to look like?

bryanj · « **Reply #62 on:** September 22, 2006, 08:53:31 AM »

What bike?

MRieck · « **Reply #63 on:** September 22, 2006, 08:55:04 AM »

I once had the main harness wear in one spot and it kept grounding a hot wire when I turned. Pain in the ass to find too!

Rushoid · « **Reply #64 on:** September 22, 2006, 09:02:18 AM »

Quote from: bryanj on September 22, 2006, 08:53:31 AM

What bike?

Sorry. '78 750F. All stock as far as I know. (I told myself, "Don't forget to tell them which bike."

)

nickjtc · « **Reply #65 on:** September 22, 2006, 01:51:25 PM »

Quote from: MRieck on September 22, 2006, 08:55:04 AM

I once had the main harness wear in one spot and it kept grounding a hot wire when I turned. Pain in the ass to find too!

Most likely candidate; look at the wiring adjacent to the headstock of the bike for signs of chafing.

bryanj · « **Reply #66 on:** September 24, 2006, 03:34:09 AM »

And the wiring to the ignition switch!

bryan · « **Reply #67 on:** September 24, 2006, 09:03:27 AM »

Quote from: MRieck on September 22, 2006, 08:55:04 AM

I once had the main harness wear in one spot and it kept grounding a hot wire when I turned. Pain in the ass to find too!

+1 My short was in the headlight basket and would blow the main fuse with the left signal if it touched ground. It took a box of fuses to find that problem

Rushoid · « **Reply #68 on:** September 25, 2006, 06:40:18 AM »

Ok. Thanks guys. Those are the areas I suspected most. Just didn't want to miss anything. I think I'm just going to carry plenty of extra fuses and limit my rt. signal usage for the time being. I'm planning on tearing...um, I mean carefully disassembling most of the bike this Winter. I'm going to get as much riding in as I can before that though! Besides, more riding should make the problem area easier to find.

Thanks again!

Rhonda750F · « **Reply #69 on:** September 25, 2006, 10:59:46 AM »

I had the same problem. Your going to have to become one with the wiring diagram. Look at all the other accessories that are in the same circuit as the rt turn sig. check all the junctions that these parts share and clean them one by one. It's a long and drawn out process, but I guarantee you'll find the problem.
It takes a while but your eyes will start to get uncrossed once you stare at the diagram long enough. Or vice versa!

I had 2 diagrams to go by, a black and white and a color, just to double check because some of the wires look identical.
Good luck.

Lumbee · « **Reply #70 on:** April 23, 2007, 06:28:31 AM »

...greetingz hedz

Bike in question is my 77 750 F2. Daily rider for the last 6 months, finally decided to do a road trip this past weekend. Baton Rouge to Hattiseburg, MS, to Little Rock, then back home. About a 1000 miles total. The problem i ran into was on the way home yesterday, about an hour out of Little Rock I blow the main fuse. Replace it, then about 50 miles later it blows again. I was keeping a pretty good pace (75-80mph), so I kept it under 65 and didn't have any problems the rest of the way home. Deductive reasoning seems to indicate the higher revs (close to 5K rpm) was causing the fuse to blow? Anyway, just looking for some input to start trouble shooting. I was thinking of adjusting the regulator. If that was set to high, would it blow the main fuse? Keep in mind the first 2 days of riding I didn't have any problems, and I was keeping 80-90mph. Any comments suggestions welcome...

dusterdude · « **Reply #71 on:** April 23, 2007, 06:41:35 AM »

i resent being called a head...lol.good luck mark.

Lumbee · « **Reply #72 on:** April 23, 2007, 06:42:54 AM »

...thats SOHC Hedz!!!

736cc · « **Reply #73 on:** April 23, 2007, 08:14:29 AM »

A broken filament in a light can cause a fuse to blow

Lumbee · « **Reply #74 on:** April 23, 2007, 08:23:04 AM »

...ahh, that is interesting seeing as how i noticed that one of the front side running lights was out. however i thought that a light being out would cause the headlight or break light fuse to be out...

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Author Topic: Main fuse keeps blowing (Read 26160 times)

kraftradfahrer

jasonbox

kraftradfahrer

kraftradfahrer

bryan