The New And Improved Unofficial R65 Forum V2

General Category => Chit-Chat => Topic started by: Lucky_Lou on June 26, 2012, 12:11:12 PM

Title: Load Shed Relay
Post by: Lucky_Lou on June 26, 2012, 12:11:12 PM

Still struggling with the electrics on the K75, i think i have 2 separate problems 1 earth trouble with the lights / indicators. 2 the real headache i am getting 12v on both sides of the start relay which only clears if you pull the LS relay out, does anyone know if the LS relay is normally closed ?
ta
Lou

Title: Re: Load Shed Relay
Post by: Bob_Roller on June 26, 2012, 12:26:35 PM

What does the load shed relay do, removes power from non essential circuits during starting ?

Title: Re: Load Shed Relay
Post by: Lucky_Lou on June 26, 2012, 01:08:09 PM

Quote

What does the load shed relay do, removes power from non essential circuits during starting ?

Yes, there is a cable running from the starter motor which activates it but i cannot work out why i am getting a live feed from it when the ignition is on.I may disconnect it to see what happens there cannot be that much load going out elsewhere.
Lou

Title: Re: Load Shed Relay
Post by: nhmaf on June 26, 2012, 10:59:55 PM

Sounds like similar function to the wiring of the headlight relay in the US-model airheads from the 80s (with the always on headlight).   The only other significant load I would think of would be the fuel pump - but you wouldn't want to shut that off while cranking a K-bike.

Title: Re: Load Shed Relay
Post by: Red_Hen on June 27, 2012, 08:32:11 PM

Hi Lou,

This may be helpful for #2 - if battery voltage is low on a K75 the starter relay can get stuck - here is a technical article from IBMWR.org

http://skylands.ibmwr.org/tom/tech/starter-relay.html

Let me know if this helps.  If not, the BMW MOA website has a tech forum for K75 bikes which helped me tremendously to learn how to work on my K75s.

Title: Re: Load Shed Relay
Post by: Lucky_Lou on June 28, 2012, 01:17:56 AM

Thanks for the link Kev, the starter relay is working fine when the LS relay is disconnected..... and its a new battery, whats happening is i am getting 12v on the output side of the start relay (not enough to turn the motor which i have stripped off to check) without pressing the start button when the load shed relay is plugged in, with the relay unplugged i only get voltage on the button.
I have ordered a new LS relay which i hope to fit next weekend and we will see what happens could be this is causing the gremlins in the other electric circuits.
Lou

Title: Re: Load Shed Relay
Post by: Red_Hen on June 28, 2012, 01:57:28 PM

Lou,
If you don't figure this out, send me a PM - I can email Paul Glaves and ask him for you.  He is a K75 expert.

Title: Re: Load Shed Relay
Post by: JPSpen on July 03, 2012, 06:26:38 PM

Stand by...

Title: Re: Load Shed Relay
Post by: Lucky_Lou on July 04, 2012, 11:44:47 AM

More info in my other thread, "Gremlin Update"........Perhaps Paul Glaves has an answer for the green wire mystery
Lou