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K100-forum.com » Technical, repair and troubleshooting » Electrical » '88 k100 not starting

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1Back to top Go down   '88 k100 not starting Empty '88 k100 not starting Mon May 06, 2024 6:30 pm

mmgee123

mmgee123
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was almost 100% my issue was a dead battery, (could get the bike started by bump starting) just replaced the battery (accidentally tried to start without plugging the big electrical plug in back in don’t know if that’s important, and it was trying to start) but then i plugged it in and it’s making the same buzzing sound as it did earlier when the battery was dead, any help?

    

2Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Tue May 07, 2024 12:15 am

Laitch

Laitch
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Is this the same problem the Brick was having in your starts runs and dies post in early Nov 2023?

Buzzing sometimes means faulty electrical connections so verify the connections to the battery are clean and tight, the battery ground connections of both the battery ground cable terminal and the transmission surface are clean and tight, and that the fuel injection control unit plug is fully engaged to the unit and cannot be disconnected from the unit by pulling outward on the cord end of the plug.


__________________________________________________
1995 K75 90,000 miles
    

3Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Tue May 07, 2024 9:18 am

mmgee123

mmgee123
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Laitch wrote:Is this the same problem the Brick was having in your starts runs and dies post in early Nov 2023?

Buzzing sometimes means faulty electrical connections so verify the connections to the battery are clean and tight, the battery ground connections of both the battery ground cable terminal and the transmission surface are clean and tight, and that the fuel injection control unit plug is fully engaged to the unit and cannot be disconnected from the unit by pulling outward on the cord end of the plug.
no sadly it’s not the same issue that was just the fuel filter i’m much better at taking care of things in that nature compared to electrical work, i’ll give that a try later today and reply back, another thing that happened when i swapped out the battery the headlight and blinkers weren’t coming on anymore? so maybe it is just a faulty connection

    

4Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Tue May 07, 2024 1:04 pm

Laitch

Laitch
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mmgee123 wrote:no sadly it’s not the same issue that was just the fuel filter . . .
Go back to that thread and include the explanation you've posted above to finish off that discussion. Your inclusion of the headlight and blinker symptoms in this thread raises more ideas that could be explored after you complete the electrical connection cleaning and inspection recommended so far.


__________________________________________________
1995 K75 90,000 miles
    

5Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Wed May 08, 2024 8:39 am

92KK 84WW Olaf

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mmgee123 wrote:was almost 100% my issue was a dead battery, (could get the bike started by bump starting) just replaced the battery (accidentally tried to start without plugging the big electrical plug in back in don’t know if that’s important, and it was trying to start) but then i plugged it in and it’s making the same buzzing sound as it did earlier when the battery was dead, any help?

I had that issue on my RS. Narrowed it down to the flasher relay. Swapped in another one and it persisted. But I still belleved it was the problem so swapped another one in and problem solved. 2 dud relays binned.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

6Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Wed May 08, 2024 9:04 am

Dai

Dai
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Lever the box off the flasher relay (a couple of small screwdrivers will do it) and watch the on-board mechanical relays. The black cover underneath is not attached to the relay board so you can't do any damage there. Lever up a long side, then a short side, then the other long side. The cover will bend alarmingly but it should come out at that point.

Mind you, if that is the problem the noise will be somewhat louder...


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

7Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Wed May 08, 2024 12:55 pm

mmgee123

mmgee123
active member
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Dai wrote:Lever the box off the flasher relay (a couple of small screwdrivers will do it) and watch the on-board mechanical relays. The black cover underneath is not attached to the relay board so you can't do any damage there. Lever up a long side, then a short side, then the other long side. The cover will bend alarmingly but it should come out at that point.

Mind you, if that is the problem the noise will be somewhat louder...
the flasher relays would be the smaller vertical box and not the one you remove the tank to get access too right? and which relays would it be?

    

8Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Wed May 08, 2024 1:07 pm

Two Wheels Better

Two Wheels Better
Moderator
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With the key on, depress a turn signal switch or the hazard switch and listen for a tell-tale click or buzz. The turn signal relay could be marked with an OEM part number of 61 31 1 459 224, or the earlier part number 61 31 1 459 004. It sits towards the rear left of the relax box and is held down by two small screws.


__________________________________________________
"How many cars did we pass today?" "ALL of them."
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

9Back to top Go down   '88 k100 not starting Empty Re: '88 k100 not starting Wed May 08, 2024 2:40 pm

Dai

Dai
Life time member
Life time member
You do need to lift the tank. It's the green one at the back of the box and has a flying lead, so you may be able to get it out without taking the tank off.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

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