Electrical issue.

QITMAN · #1 PostAuthor: **QITMAN** » Thu Jan 09, 2014 5:36 pm

Hi all

wonder if any of you fine folk can assist me with the reason my main fuse blowing on my 1976 kz900. It does not blow right away only after 20-30 miles?

Thanks in anticipation

Mick

Fred the Zed · #2 PostAuthor: **Fred the Zed** » Thu Jan 09, 2014 6:14 pm

POSSIBLY its the Regulator / Rectifier overheating. Had a similar problem on a Firestorm a few years ago... Replaced the unit and problem was solved. Others here might have alternative solutions or know how to test the unit to be sure before splashing out for a new one.

Fred

#3 PostAuthor: **chrisu** » Thu Jan 09, 2014 8:24 pm

good place to start - 13.6 to 14.2v about right - more can cause problems.

or vibration ?

QITMAN · #4 PostAuthor: **QITMAN** » Thu Jan 09, 2014 9:09 pm

Thanks for the replies. I wanted experts to tell me what I sort of guessed might be the problem. Thanks again as I,ll start there and see how it goes.
Mick

Jay1969 · #5 PostAuthor: **Jay1969** » Thu Jan 09, 2014 9:28 pm

Also worth checking the wiring in the headlight cowl,
folks on here have experienced wires in there shorting out.

QITMAN · #6 PostAuthor: **QITMAN** » Fri Jan 10, 2014 7:11 am

Good point

#7 PostAuthor: **Taffus** » Fri Jan 10, 2014 7:29 am

Main fuse terminals corroded, the usual culprit

QITMAN · #8 PostAuthor: **QITMAN** » Fri Jan 10, 2014 7:37 am

Thanks Taffus, think I'll try that first as this is probably the cheaper option to start with.

Big Fluff · #9 PostAuthor: **Big Fluff** » Fri Jan 10, 2014 8:58 am

Check the white wire from the fusebox to the ign switch. Often they rub on the headstock or headlamp bowl. Also the insulation may look ok but wire strands break within causing higher resistance.

Garn 1 · #10 PostAuthor: **Garn 1** » Fri Jan 10, 2014 9:23 am

Most common place for cause of fuse blowing on Kz900 is wires from front brake pressure switch to (Jay1969) Head light shell.
That fuse box area always shows signs of heat also!
RegardZ.

Pigford · #11 PostAuthor: **Pigford** » Fri Jan 10, 2014 9:54 am

ALSO;

The Kill Switch can be a PITA :shock:

#12 PostAuthor: **KeithZ1R** » Fri Jan 10, 2014 10:08 am

Look at the fuse condition it will give you clues :idea:

if its disintegrated or vaporised the clue is a bad and direct short, discoloration or deformation in the element before fracture suggests a resistive leak that is weakening the fuse by overheating a good way of checking is to get your multi meter in series with fuse and see what current is passing through it ( the fuse ) its all good practise for 30 year old bikes

Jay1969 · #13 PostAuthor: **Jay1969** » Fri Jan 10, 2014 11:02 am

Garn 1 wrote:Most common place for cause of fuse blowing on Kz900 is wires from front brake pressure switch to (Jay1969) Head light shell.
That fuse box area always shows signs of heat also!
RegardZ.

Garn, are you saying I'm a Head light shell? :shock:

QITMAN · #14 PostAuthor: **QITMAN** » Fri Jan 10, 2014 12:27 pm

Thanks men
this will give me some ammo to try and rectify the problem when I get back from Nigeria next week.

Thanks again.

Maybe paypal will then forward my membership fee from the UK as its not doing it from over here "the scam country of the world"???

Z1parR · #15 PostAuthor: **Z1parR** » Fri Jan 10, 2014 8:46 pm

I hope you're not over there to collect a bike from a prince :wink:

Electrical issue.

Electrical issue.

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