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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: frankenduck on May 31, 2011, 02:28:40 PM

Title: Relay box layouts
Post by: frankenduck on May 31, 2011, 02:28:40 PM

The load shedding or unloader relay turns off the headlight and a few other things when you are starting the bike in order to make more electrical power available to the starter motor.

Title: Re: Relay box layouts
Post by: rbm on September 16, 2013, 07:56:57 PM

Thanks, Tim.  Page reconstructed from cached images in Google:
Early K75/K100:

Front of the bike
(https://lh5.googleusercontent.com/-pQqtuvYgyfA/UjeYHdaoPnI/AAAAAAAACw4/7ODdX_5Zjwk/s800/relaybox_early.jpeg)

(https://lh3.googleusercontent.com/-PAUqspiqaCo/UjeZNMAHs9I/AAAAAAAACxQ/JhBL410WaRo/s800/relay-tray.jpg)

ABS I Bikes:

(https://lh6.googleusercontent.com/--qB6HmNAvlA/UjeYZ3onG9I/AAAAAAAACw4/YDN9HOk5_yI/s800/relaybox_abs1.jpeg)

ABS II Bikes:

(https://lh3.googleusercontent.com/-9sjnwkqG8VU/UjeYHcc6A8I/AAAAAAAACw4/hl4l6jpdBYU/s800/relaybox_abs2.jpeg)

The load shedding or unloader relay turns off the headlight and a few other things when you are starting the bike in order to make more electrical power available to the starter motor.

Title: Re: Relay box layouts
Post by: The Mighty Gryphon on April 03, 2017, 01:19:35 PM

What are the functions of the relays in the box of a 1994 K75RT?  What do the blue relays do?

The inside of my box doesn't match anything I can find on the interweb. 

Title: Re: Relay box layouts
Post by: Laitch on April 03, 2017, 01:42:46 PM

Quote from: The Mighty Gryphon on April 03, 2017, 01:19:35 PM

What do the blue relays do?

If this were my conundrum, I'd use the MAX fiche photos and try to identify them by the number of their terminals, the orientation of their terminals and their positions in the box. Happily, it isn't mine—not now anyway.

Title: Re: Relay box layouts
Post by: The Mighty Gryphon on April 03, 2017, 02:52:28 PM

Been there Laitch.  No help. 

Title: Re: Relay box layouts
Post by: Martin on April 03, 2017, 03:15:28 PM

Possibly ABS, pull them and see what doesn't work.  :dunno
Regards Martin.

Title: Re: Relay box layouts
Post by: jakgieger on April 03, 2017, 03:49:18 PM

Is this a joke MG???? Left=ABS   Right=fuel pump  This is the same setup on my 89.

Title: Re: Relay box layouts
Post by: The Mighty Gryphon on April 03, 2017, 04:15:31 PM

Not the fuel pump.  I pulled it and it still ran.  Fuel pump appears to be the black one in front of it. 

The two blue relays are for the ABS as far as I can tell by process of elimination.  I would just like to confirm it.  The schematic shows two.  One should be the main and the other is for the cluster light.  According to the fault I'm reading for the ABS system, one of them has a problem.  I'm guessing it is the big one, but when I test it it tests good. 

Title: Re: Relay box layouts
Post by: jakgieger on April 03, 2017, 05:58:15 PM

I would get fixated on color...or position :bmwsmile .  Start by confirming operation.  Perhaps you have a mix of ABS1 and 2 diagram above, ie., one abs relay, but a block of four for load shed, horn, fuel, and fan???

Title: Re: Relay box layouts
Post by: Filmcamera on April 03, 2017, 06:04:50 PM

In my box all blue relays are ABS

Title: Re: Relay box layouts
Post by: Grim on April 09, 2017, 09:31:50 AM

^Yep blue is ABS. 

When I was forced to delete my ABS pulling both blues got rid of the flashing ABS lights.