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Old 11-10-2014, 02:48 PM   #1
DiabloADV OP
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Most basic charging/ignition harness?

In the MaxBMW parts fiche, the "engine wiring harness" for /5 and /6 is the same number. It's only $48.

I was going to build up this harness, but for $48 I can't pass up a new one.

Can someone tell me what is included in this harness? I'm only looking for the basics to start and run the bike. No lights since that will all be custom anyway.

Charging, incl. charge light
Ignition
Starter

Will this harness work?
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1974 R90/6 motor w/1050 kit; twin plugged; installed in...1970 R60/5 frame; RM125 front end; KZ1000 Police Tank.
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Old 11-10-2014, 02:49 PM   #2
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Motor is /6, BTW. But I don't think that makes any difference...
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Old 11-10-2014, 02:50 PM   #3
disston
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I'd say if that includes the battery cables it is a good deal. Maybe not though.
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Old 11-10-2014, 02:52 PM   #4
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Originally Posted by disston View Post
I'd say if that includes the battery cables it is a good deal. Maybe not though.
Don't think it includes battery cables. But...what does it include? What connections?
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Old 11-10-2014, 02:55 PM   #5
disston
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Here's the pic from Max;

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Old 11-10-2014, 03:02 PM   #6
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So...what am I looking at there, with respect to the wiring diagram?
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Old 11-10-2014, 03:23 PM   #7
Big Bamboo
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The plug on the upper right goes to the regulator and I think the other bundle near it goes to the starter relay. It looks like the opposite ends go to diode board and the alternator. You will need the 3 wire harness from the diode board to the alternator as well.
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Old 11-10-2014, 03:33 PM   #8
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Originally Posted by Big Bamboo View Post
The plug on the upper right goes to the regulator and I think the other bundle near it goes to the starter relay. It looks like the opposite ends go to diode board and the alternator. You will need the 3 wire harness from the diode board to the alternator as well.
So...no points-to-coils ignition connections? But looks like most everything else. I already have a new 3-wire bundle.
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Old 11-10-2014, 03:42 PM   #9
Big Bamboo
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The wire from the points goes to the condenser, that harness may well have the one from condenser to coil. Hard to tell from that picture or the wiring diagram.
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Old 11-10-2014, 03:43 PM   #10
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Originally Posted by Big Bamboo View Post
The wire from the points goes to the condenser, that harness may well have the one from condenser to coil. Hard to tell from that picture.
Got it. Thanks. That connector is simple enough to work up if it's not there.
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Old 11-10-2014, 04:03 PM   #11
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If you already have the plug for the regulator, you can pop the female spades out of it easily. Then you're paying $48 for seven or eight wires, 14-15 connectors and some heat shrink. Seeing as you're geared-up to do the other harness work yourself, I don't see the economic logic, but then I'm a bit "thrifty" at times.
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Old 11-10-2014, 10:25 PM   #12
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Quote:
Originally Posted by DiabloADV View Post
Got it. Thanks. That connector is simple enough to work up if it's not there.
Pulled the tank off my /6, one of those black wires is indeed the connection from condenser to coil. Also, the starting circuit can be as simple as connecting the positive wire at the starter to the solenoid connection with an intermittent switch.
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Old 11-11-2014, 05:51 AM   #13
190e
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The simplest ignition and charging wiring system would be a combination of these two diagrams. Both are generic of their type so the model designations can be ignored




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Old 11-11-2014, 09:09 AM   #14
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Many thanks. I dug around and I found an old tired version of that harness so I now know what it does. For the price, it's enough of a time savings to be easily worth it to me.
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Old 11-11-2014, 11:49 AM   #15
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I replaced the main harness on my R80 G/S last year & decided to buy a new one vice trying to build one from scratch. Yes, you can push the spades out of connectors & reuse them as well as some of the old wiring, but putting out a few more $$$s for a new harness will pay dividends in the long haul. Old connectors will be corroded & wires brittle. By the time you source all the different colour coded wires & connectors, particularly the 90 degree ones, spend the many hours piecing it all together..... You made the right call IMO. We're fortunate that there are still new parts available for these old bikes and that the design of the wiring is relatively standard between the various models of that vintage.

I don't recall what online retailer I ordered my harness from, but it cost more than $48, somewhere in the neighbourhood of $250 IIRC. I don't regret spending the money for a second. Here's what the old one looked like after many repairs under the steering triple.







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