BMW K bikes (Bricks)

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Dai

Dai
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There are two relay pin-out standards in existance; Type A and Type B. Type B is the common type that you buy over the counter almost anywhere. Type A is much rarer and yes, these are the type fitted to the K series. If you upend the relays and look at the pin numbering, this is the way to tell the difference:-

- Type A has pin 85 opposite pin 30
- Type B has pin 85 opposite pin 86

The pins numbered 87-something are the outputs.

- On a four pin relay, pin 87a is connected to pin 30 when power is applied across the coil. Frequently used as a horn relay.

On five-pin relays,

- 87 and 87 are two linked outputs. When the relay coil is not energised, these two pins are still connected together. When the relay coil is energised, continuity is pin 30 - both pins 87.
- 87 and 87a is a changeover relay. When the relay coil is not energised, continuity is pin 30 - pin 87a. When the relay coil is energised, continuity is pin 30 - pin 87.
- 87 and 87b are two independant outputs. When the relay coil is not energised, neither pin is connected to pin 30 or to each other. When the relay coil is energised, continuity is pin 30 - pin 87 and 87b. This is the fuel injection relay type.

Type A relays are getting harder to find and frequently come in at almost twice the price of a Type B relay. A premptive strike against the possibility of a relay failure is to swap terminals 30 and 86 in the relay housing and drop in a set of Type B relays. If you pull a relay and look in the relay housing, there is a small cutout on one side of each terminal. Push a thin blade into that cutout; this will depress the terminal latch and allow you to pull the terminal out of the relay housing. Before pushing it back into its new position, pull the latch back up to an angle of about 20 degrees so that it locks again.

None of this terminal-swapping applies to later models that are fitted with micro-relays. They have a completely different and consistent pinout as they are relatively modern. However, the description of the actions by pin number still apply.



Last edited by Dai on Tue Mar 24, 2020 7:07 am; edited 2 times in total


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'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

chris846

chris846
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I saw the thread title and thought there were three types

Ionic, Doric, and Corinthian?

(Okay it's a bit obscure)


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Sometimes I'm not really Suzi Quatro.
    

Dai

Dai
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So it took me around thirty seconds to figure it out. Go away and lock yourself in a dark room for the duration.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

chris846

chris846
Life time member
Life time member
Thanks for the top quality tip re. swapping the relay terminals over, never realised that was all it took. One to remember.

PS Are you sure you figured it - it was very obscure. Only sticks in my mind 'cause I had a great colleague many years ago who used to walk around muttering "Ionic, Doric , Corinthian". Stress of the job back then I suppose. Didn't have the current level of mental health awareness.

In fact, during these mad, locked-up times, I think I'm going to sit down and watch every Mel Brooks film that I can find. If that doesn't help then maybe its time to call it a day  Smile

Was this a thread about relays? Sorry  Embarassed


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Sometimes I'm not really Suzi Quatro.
    

Dai

Dai
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Went and checked. Maybe I didn't get it after all Evil or Very Mad What's columns got to do with relays? Initially I thought that they might also refer to a sporting event.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I always thought Doric, Ionic, and Corinthian were orders.  I guess I don't get the relay reference.  But then, I'm a victim of educemucation in the U.S.

???


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Laitch

Laitch
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I don't care.


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1995 K75 81,000 miles
Relays, relays, relays - types and substitution Usa-lo10
    

Dai

Dai
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Life time member
Not sure I do! Twisted Evil First that came to mind was actually Insulation Displacement Connectors but I havena gotta clue whit thez haz to do wi' relies.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

MartinW

MartinW
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I was just going through a few old relays and testing them, and I found this a Narva 68024 which had been fitted to my Brick from they day I got it. After it played up intermittently in Dec 2017 I replaced it with an OEM one and threw into my assorted electrical stuff. As I was testing them I compared it with a spare OEM one and it looks to be the same configuration. Price online 16.90 delivered Munich's relay $44.00 plus delivery. 
Regards Martin.
Regards Martin.Relays, relays, relays - types and substitution Narva_10


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K75s Hybrid
    

10Back to top Go down   Relays, relays, relays - types and substitution Empty Relays on Wed Mar 25, 2020 4:23 am

daveyson

daveyson
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Life time member
So the picture on the right is almost the same,  but as Dai notes, pins 30 and 86 are swapped, that's a problem. Hopefully the previous owner was too lazy to swap the wires around when he installed the wrong relay, since you now have the correct one.

One of my bricks, blacky of course, had these pins swapped, but Bosch and both 87, just to add another layer of confusion.

An easy option,  next time you go past a car wreckers, look under BMW bonnets  for a light green, five pin relay. I'll bet my bottom dollar the part number will be 6136-8373700. That's a substitute.

C'mon Chris, help us out, you've kept us in suspenders long enough, need some more clues.


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

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