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Ianbuck
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1973 750 Bonnieville quit running?
#90018 04/03/06 7:12 pm
Joined: Mar 2006
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My 73 Bonnievilles runs fine until you turn the light on and then it losses power and finally quits, cut off the light and it fires up and runs fine, turn on the light again and it it like flipping the kill switch? I need some advice! Please


Cliff Ginger
71 Bonneville 650RR?
73 Bonneville 750 (sold)
73 Trident
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Re: 1973 750 Bonnieville quit running?
#90019 04/03/06 7:47 pm
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I had something similar happen with my 68 BSA Lightning. I switch the bike on, flip the toggle to park lights, no problem, switch the main beam on and nothing. It was popping the fuse, but I found the culpret was related to bad grouding on my dip switch. I had a piece of rubber between the handlebar and the switch , which was causing it to not ground the switch and blow fuses.

It's not exactly the same thing that you are experiencing, but I would check the grounds on your light circuit.


Jer

http://www.caferacer.ca

1968 BSA Lightning Cafe
1968 BSA Thunderbolt
1969 BSA Royal Star
1972 BSA Thunderbolt
Re: 1973 750 Bonnieville quit running?
#90020 04/03/06 8:49 pm
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1:bad battery
2:bad alternator

Check battery and alternator..you have something wrong with that parts..
It is like this..your voltage dropps when you put your light on..

Dogge.

Re: 1973 750 Bonnieville quit running?
#90021 04/06/06 8:43 pm
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i think battery and or charging system as well, i'd start by checking the battery,i guess your running electronic ignition,

hunt
tiger 650

Re: 1973 750 Bonnieville quit running?
#90022 04/07/06 4:28 am
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not running electronic ignition. I will do some checking on the battery and alt. and let you guys know what i find.


Cliff Ginger
71 Bonneville 650RR?
73 Bonneville 750 (sold)
73 Trident
Re: 1973 750 Bonnieville quit running?
#90023 04/07/06 5:26 pm
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Check it out. I have an article on the very subject on the GABMA web page.... http://gabma.no-ip.org/

:bigt:


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: 1973 750 Bonnieville quit running?
#90024 04/08/06 1:16 am
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Mine used to misfire occasionally with the 55W headlight on, I think it was Mr RFW who mentioned that a dedicated engine earth may help, it surely did, off a rockerbox bolt and back to the battery.


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: 1973 750 Bonnieville quit running?
#90025 04/08/06 5:48 am
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G-Man -
Remember the headlamp uses more current (ie empties the battery faster) than any other component on the bike. So when bad things happen all of a sudden when the HL is turned ON, and then suddenly clear up when turned OFF again, it's a sure sign of battery issues. Either the battery isn't being charged, or the battery can't hold the charge it's receiving.

This doesn't necassarily mean big money. The last 2 times this happened to me the altenator lead had slipped off the rectifier terminal. A different one each time!

:bigt:


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: 1973 750 Bonnieville quit running?
#90026 04/09/06 1:26 am
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FWIW
Do you have a 3-position ignition switch?
Same thing happened to me on my 79. Switch to lights and engine dies. Bad switch.
just my 2c
HTH
Steve


Steve in Tulsa
Re: 1973 750 Bonnieville quit running?
#90027 04/09/06 10:47 am
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Yo, all.
I once experienced a real short circuiting inside my head lamp shell - isolation scrubbed off. When switchin on the light - "game over".

So, an el test with lamp and/or instrument always helped me (often with engine running to get the faults you hardly get witout engine vibration).

regards
jangg


'73 Commando Basket - new aluminium cyl
'93 Ducati 900 SS

"Better lit a light than cursing the darkness"
(Confucius)

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