Blown fuse(s) / relays??? - K-Bikes.com - Excellence in Motion
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post #1 of 24 (permalink) Old May 11th, 2012, 9:06 pm Thread Starter
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Blown fuse(s) / relays???

Hi I'm new to posting here but have been trolling for years. I need some help with my 88' K75. I had a short on the groung wire of the headlight connection. I bought a new pig tail at the auto store and spliced the wires together and good as new. Started up and all the lights worked.

So i go out and start the bike this afternoon to go to work and it starts fine but i don't have any lights at all, no signals or horn. I haven't had time to really investigate but I am assuming that a fuse or fuses have blown or possibly a relay. But my main question is why, just timing? I haven't changed anything on the electrical.

Thanks.
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post #2 of 24 (permalink) Old May 12th, 2012, 3:50 am
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Since you got no lights, horn or flasher, you have a problem with the load shedding relay.
You find it in the relay box, in the middle at the front of the box.
Try to swap with the horn relay (front, right), if that doesn`t solve your problem....you have to check the related wiring.

Inge K.
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post #3 of 24 (permalink) Old May 12th, 2012, 11:15 am
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Yes that relay, the original ones were not very good and were updated. If I remember they went from a metal cased one to a plastic one right around them years, 88 or so. Always carried one as a spare anyway, had to run without a horn in traffic a little too long for my liking once when I switched them.

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post #4 of 24 (permalink) Old May 17th, 2012, 8:38 pm Thread Starter
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After further investigation switching the relays was not successfull.

I am begining to narrow down the culprit. Testing the fuses I only have voltage to slots one and three and no power to the remaining slots, according to the wiring diagram slots 3,4 and 5 all share a power source, so.... I need to trace those wires out.

I also tested the power to the relays themselves and found that they all had power going to them except for the top right relay which i believe is the horn relay....

I belive that i am going to need a new wiring harness.......
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post #5 of 24 (permalink) Old May 18th, 2012, 5:51 pm
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Quote:
Originally Posted by jquinn
After further investigation switching the relays was not successfull.
Do you got power in both terminal 30 and 86 at the LSR socket (ignition on)?
A malfunctioning LSR could also be caused by worn starter brushes or dirty commutator,
as the LSR coil is grounded via starter brushes......slow turning and less cooperative starter lately?..........also check ground at terminal 85.

Quote:
Originally Posted by jquinn
Testing the fuses I only have voltage to slots one and three and no power to the remaining slots, according to the wiring diagram slots 3,4 and 5 all share a power source, so.... I need to trace those wires out.
Fuse 1: OK.
Fuse 2: is only powered with lights on, park or main.
-------------------------------------------
Fuse 3: OK.
Fuse 4: power socket, if mounted.-------------------3,4,5 is unswitched.
Fuse 5: optional extras
-------------------------------------------
Fuse 6: is only powered when starter button is pressed, or engine is running (FI relay).
Fuse 7: is only powered when the LSR relay is present, and functions.

Quote:
Originally Posted by jquinn
I also tested the power to the relays themselves and found that they all had power going to them except for the top right relay which i believe is the horn relay....
Horn relay socket is only powered when the LSR relay is present, and functions.

I don`t think you need a new wiring harness, yet.....

Inge K.

Last edited by IngeK; May 18th, 2012 at 6:07 pm.
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post #6 of 24 (permalink) Old May 18th, 2012, 7:57 pm Thread Starter
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I need a little hand holding here. What is the LSR?

The starter has been fine but the sprag gear is not engaging so it won't start right now either. But one thing at a time.....
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post #7 of 24 (permalink) Old May 18th, 2012, 8:13 pm
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Quote:
Originally Posted by jquinn
I need a little hand holding here. What is the LSR?
Load Shedding Relay.

Inge K.
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post #8 of 24 (permalink) Old May 18th, 2012, 8:23 pm Thread Starter
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I'll try and borrow a working LSR from Anton on Monday and see if that does the trick...
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post #9 of 24 (permalink) Old May 18th, 2012, 8:36 pm
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It`s just a standard relay...you can test it yourself...12v+ on 86, ground 85..you should hear and feel that the relay clicks.
And then you should have continuity between 30 and 87.

Did you measure if you got power and ground in the socket?

Inge K.
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post #10 of 24 (permalink) Old May 18th, 2012, 9:02 pm
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Sorry..........it`s now 03:00 AM in Norway............Good night.
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