BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Charge leakage Empty Charge leakage on Thu Jun 04, 2020 8:58 am

tinyspuds

tinyspuds
Life time member
Life time member
Morning,
Yesterday during a 100 mile jolly I noticed that my voltmeter was steadily dropping value and not picking up at all regardless of revs. The charge light was flickering at 1k rpm and below but went out above that. Turned off all lights and accessories and got home with an indicated 9 and a bit V. Put the battery on charge. Drank beer.

Did a leakage test this a.m.

- Key out
- Disconnected -ve lead
- Voltmeter across -ve battery terminal and lead 13+v (same as across battery terminals)
- Switched off +ve isolator, leakage dropped to a few mV
- Isolator back on turned key on, leakage dropped by under 1v to 12 something
- Turned key off and started pulling fuses 1 at a time
- The clock/indicator fuse reduced leakage to a few mV
- I use the clock power from the fuse box to run my sat nav instead of the clock with the Earth lead connected to the starter relay -ve. Disconnected sat nav wiring, no change to leakage numbers
- Disconnected the +ve leads from alternator and eliminated all but the heavier of the two reds that feed into the relay box which continued to show the leakage when connected to the +ve battery lead
- Disconnected the starter relay terminals, leakage unchanged
- Disconnected the flasher unit and leakage dropped to a few mV
- Inspected flasher internals, no obvious heat or other damage, Reconnected unit, removed all indicator bulbs and leads, still leaking.

My lock down projects have all mostly been electrical, including fairing off and wiring up 3 accessory rockers, re wiring my aux fuse box (disconnected for these tests), seat unit and rear lights / indicators off and unplugged. Plus installed a used 50 amp alternator.

Thoughts please on my diagnostic process, sound or rabbit hole?

I’m assuming its a short in the flasher unit. Even though all the flashers work.

I’ve looked at the testing vid in the download section, but would rather spend the money replacing the unit than on the 200 mini croc clips needed to do the testing.
Are there any quick flasher unit tests?

Have I isolated the problem, or have I missed an entire section of ‘obvious’?

Thanks as always folks.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1954 Royal Enfield 350 Bullet. Original.
    

2Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 9:56 am

BobT

BobT
Life time member
Life time member
Dead simple, your alternator is not charging. You are complicating the whole thing, the battery only exists to start the bike and then is redundant. The alternator supplies all the volts to charge the battery and supply the power when the engine is running.
Things like GPS and clock use hardly anything.

    

3Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 11:37 am

tinyspuds

tinyspuds
Life time member
Life time member
Thanks Bob, would have been my first thought too but I had reason to believe that wasn’t the case. So went by the book (clymer) which starts with a leakage test.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1954 Royal Enfield 350 Bullet. Original.
    

4Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 12:10 pm

Dai

Dai
Life time member
Life time member
Oh shit.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

5Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 12:12 pm

Dai

Dai
Life time member
Life time member
Check the blue wire on the alternator. If that's not the problem, PM me and I'll send you a new regulator.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

6Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 12:49 pm

Ringfad

Ringfad
Life time member
Life time member
"Drank beer.

Did a leakage test this a.m."

I have the same problem  Very Happy


__________________________________________________
Charge leakage Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 60k miles   ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) now a RS
    

7Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 1:22 pm

Dai

Dai
Life time member
Life time member
Evil or Very Mad


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

8Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 3:16 pm

tinyspuds

tinyspuds
Life time member
Life time member
From here it looks like I have some missing posts, so if you’ve seen this before, apologies.

Ringfad, thanks. I needed a grin as I think I have blown the EFI unit setting up the alternator output test.

Dai, no sweat. Can’t tell yet (see above) but I am getting an exciter field as the glow light comes on below 1k rpm and goes out above (as per yesterday).

BobT has cut to the chase but I am still intrigued by the leakage test results, irrelevant or not. Chasing the ghosts. Anyone have a view on what I’m seeing/measuring?

Will continue with the alt test tomorrow. atm it seems I have no fuel pumping although the pump is running, I have sparks so assume HES and ECU ok. Tank has been on its side all day as I was playing with relays so may be connected.

If I needed to be anywhere I’d be pissed off.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1954 Royal Enfield 350 Bullet. Original.
    

9Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 4:34 pm

Dai

Dai
Life time member
Life time member
I have a spare FICU...? If you're still running (!!) what's the voltage on the big red wire on the alternator when revved? Do NOT disconnect the battery - it acts as a partial excess voltage sink.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

10Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 5:09 pm

tinyspuds

tinyspuds
Life time member
Life time member
Thanks Dai. I have what was a working spare. Tomorrow should see it running again once I can get some fuel moving. Not sure if Ive blown the FICU or not. Just got to work thru the diagnostic.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1954 Royal Enfield 350 Bullet. Original.
    

11Back to top Go down   Charge leakage Empty Re: Charge leakage on Thu Jun 04, 2020 6:00 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
@Ringfad wrote:"Drank beer.

Did a leakage test this a.m."

I have the same problem  Very Happy
If you are stuck a hose clamp is a good fix.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles.
    

12Back to top Go down   Charge leakage Empty Re: Charge leakage on Fri Jun 05, 2020 8:35 am

tinyspuds

tinyspuds
Life time member
Life time member
Anyone know if the hose from the fuel pump should be connected to the filter?

So, anyway, bike is running again and the alternator is not charging. Dai dont worry about the regulator unless you have them coming out your ears. I’ll check out the brushes and sort it out from there.

Glad that I installed that voltmeter.

Thanks all.

PS. While I was working in the relay box chasing the original fault I had the fuel tank   on its side against the fairing. I reckon I kinked the output line and pump pressure forced the filter hose off.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1954 Royal Enfield 350 Bullet. Original.
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum