Recent Posts

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81
Welcome To Motobrick.Com / new member
« Last post by benmaxwell on October 14, 2026, 07:42:40 PM »
Hi,im a new owner and joined to learn more about maintenance, restoration, and parts.
I hope to read the discussions, ask a few questions, and contribute when I can. Thanks.
82
The Motobrick Workshop / ignition switch wiring problem
« Last post by rall275 on October 14, 2026, 03:57:52 PM »
1988 BMW K75C

I replaced a right combo switch and all was going well.  Had to remove the cockpit of this C to get her in.  Put everything back together.  Tried connecting negative battery cable and it sparked and I have some wire damage. 

What happened?

I'm not that good with electricals, but I've done a lot of work to this bike and it runs nicely.  I changed the combo switch because ever since I've had it the kill switch portion did not work.  Then, on occasion my bike would die while running but would start right back up, so I suspected that start/kill switch. 

Photos will show this:
A red wire in the loom in the relay box had melted insulation.
This wire went to the connector under the fuel tank.   Both parts of the connector show the same wire experiencing heat damage.  The wire going to the ignition switch was hot, and there is damage to one of the pins on the ignition switch.

My suspicion is the ignition switch was bad or a contact had broken on it.  I did have to carefully let the ignition switch and the pad it connects to dangle during my combo switch swap.  Maybe that weakened a connection on the ignition switch?

Any advice welcome on how to determine the cause and what you'd recommend for the cure.

I'll send photos showing this damage. 

* wiretobottomconnector.jpg (52.63 kB . 432x576 - viewed 138 times)
* igswitchconnecttop.jpg (68.23 kB . 768x576 - viewed 142 times)
* ignswitch.jpg (47.46 kB . 432x576 - viewed 140 times)
* relay box.jpg (70.44 kB . 768x576 - viewed 138 times)
83
Project Custom Motobricks / Re: No gear / neutral earths activated on BEP 3.0
« Last post by Doingitdeeper on October 13, 2026, 04:26:47 PM »
Ok an update and it gets odder. CC port only kicks out about 5v so that's great for LEDs, not much else.

1. When the Speedo switched live is plumbed into the switched live on the bep unit, neutral light doesn't work. Everything else fine.

2. When the Speedo live is plumbed into the permanent live, all the N and gear lights work fine. But only when the killswitch is set to OFF!

This doesn't make sense to me. What can possibly be causing an issue from the killswitch against the permanent feed? It could be a feed into the BEP that's coming from the OEM lunchbox plug?

So essentially, I reckon it's the killswitch being ON that's killing whatever connection is required by the BEP unit to display gears and neutral. I can't fathom it!
84
Project Custom Motobricks / Re: No gear / neutral earths activated on BEP 3.0
« Last post by Laitch on October 13, 2026, 09:53:27 AM »
Quote from: Doingitdeeper on October 13, 2026, 07:41:47 AM
I have no earth created on the bep output gear selector side. I do wonder if me not using the CC output is affecting the circuit somehow. I don't need that as a constant feed . . .
From the instructions I read in the purple section of the diagram I posted, I believe you are correct that not using the CC output is at the root of the problem, and that you do need the CC output in the circuit. It's certainly worth trying.
85
Project Custom Motobricks / Re: No gear / neutral earths activated on BEP 3.0
« Last post by Doingitdeeper on October 13, 2026, 07:41:47 AM »
Hiya thanks yes I tested the three yellow wire outputs from the selector with a multimeter, they sequentially create an earth and then in neutral all are earthed.

I have no earth created on the bep output gear selector side. I do wonder if me not using the CC output is affecting the circuit somehow. I don't need that as a constant feed, I use the BAT output for constant (for Speedo memory) and then SWP for the switched live to turn the Speedo on with the key.

Something's amiss. I'm going to retest the gear outputs and see if they're not giving a true earth.

Even with a test light between the N output on the bep unit (should be earth) and the battery live, it doesn't light up.

Odd because I've seen others have this gauge working.
86
Project Custom Motobricks / Re: No gear / neutral earths activated on BEP 3.0
« Last post by Laitch on October 13, 2026, 07:13:12 AM »
A 40 year-old gear indicator switch is always the first suspect because it is vulnerable to water infiltration and corrosion. There are several threads online concerning cleanup. You indicate you've tested it so moving on. Did you receive the supplement below with your initial BEP 3 instructions that describes gear indicator wiring? A link to the original PDF is attached below.

87
Project Custom Motobricks / No gear / neutral earths activated on BEP 3.0
« Last post by Doingitdeeper on October 12, 2026, 06:17:48 PM »
I have been using a BEP 3.0 slim fit ages now but with a Speedo that required a positive feed for the neutral light, and no gear indicator.

I recently bought a Speedo with a full gear indicator ability and neutral light - all that should be compatible with the bep 3.0 outputs of an earth once the logic is ran through it from the OEM gear cables.

The gear indicator is working properly - I have tested it.

The bep unit itself isn't providing an earth on ANY gear output, is there something specific I need to do with the box to make this work?

None of the jumpers on it are related to gear indication. Everything else is hooked up correct and works.

If I ground any of the gear selector wires to the Speedo, it lights up the appropriate gear. It's also been tested on a bench and works fine with a direct earth.

Am I missing something?

The units never got wet and has about 700 miles on it.
88
The Motobrick Workshop / Re: K100RS mirror pod problems
« Last post by Ingo on October 10, 2026, 09:23:10 PM »
Inside the mirror pod there are "cups" with prongs, fingers or teeth (whatever term you prefer). These grab onto the head that sticks out from the fairing.  Just bend them back with a small flat screwdriver. Be careful and don't overdo it. Considering the age of our bricks they likely just lost tension.
89
The Motobrick Workshop / Re: Euromotoelectrics - Fuel level float sender
« Last post by Jethroww on October 10, 2026, 08:46:07 PM »
Hi removed the sender and have some more pictures of the sloppy soldering jod that was done on the sender by the manufacture.


I resolder the broken wire. Sanded and used flux to resolder the wire(hind sight should have resolder all of the wires)
Working now.
That's for the help.
Jethroww
90
The Motobrick Workshop / K100RS mirror pod problems
« Last post by Duckbubbles on October 10, 2026, 11:57:14 AM »
The right hand mirror pod on my '85 K100RS comes loose far too easily.  The top two "studs" allow the mirror to come loose when hitting a decent sized bump when riding.  The mirror doesn't fall completely off (thank heavens) but I need to stop pretty quickly to re-attach it before it can come completely off.

Does anyone know of a fix that will attach the pod more securely?  I know there are tethers that keep the mirror pod from hitting the ground, but I am looking for something else.

Thanks.

Frank
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