charging light

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chris plant

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hi all,I think I have a problem that all you electrickery guys can sort out, turn ignition on charge light,warning light assimulator comes on,start bike and light almost goes off,just visible,dim.every thing works ok,brake lights pilot lights,head lights,horn,indicators all ok,im using a boyer ei ignition and boyer power box for charging battery,alternator is brand new from andover Norton any ideas please chris.
 
If you increase the revs does it go out, before mine broke and I replaced it with a modern replacement mine did the same but it did last 30 years.
 
Do you have the instructions for the power box? I thought I read some where that the Boyer Power box is not compatible with the factory assimilator.
I could be mistaken, wouldn’t be the first time.
Pete
 
Deets55 said:
Do you have the instructions for the power box? I thought I read some where that the Boyer Power box is not compatible with the factory assimilator.
I could be mistaken, wouldn’t be the first time.
Pete
Click to expand...
Would be good to know as the light on the Titanic doesn't seem to go dark and it has a Boyer.
 
Here is a link to the Power Box instructions

http://www.boyerbransden.com/pdf/PBOX00108.pdf

States that you must remove the assimilator when using the Power Box unless you have the Box that is designed for a charging light. Looks like there are at least two boxes available.

Pete
 
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Chris,
A low battery will be pulling all the time from your alternator. You will notice the red light dimly on when your engine is at idle with the Head lights on and when you have your signal lights going. Charge the battery and take the fuse out and leave it a day or so. Then give us the voltage of the battery at the posts. If your battery is only showing about 12 volts at that time, yours is probably going to go south soon. A good lead acid battery fully charged should be 12.7-12.9 v after sitting.
One of the things I always do if my bike will stay dormant for a number of months,(winter time for us canuks) is to disconnect the fuse. My bike has a parasitic draw on the battery. Not good for the battery if it sits below 80% for any length of time.
Cheers,
Thomas
 
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thanks commando,it dosent go off with revs increase.deets I don't think ive still got the instructions but I think mine is compatable with the assimulator.canuk thanks I think that could be it,battery was showing 12.2 volts on my cheap multi tester,also what I should have mentioned was that after starting pressing the headlight flasher and the horn[not at same time]nearly cut the engine,will put battery on charge and see,also when blipping the throttle my multi tester was showing an increase in voltage but the charge light was still very dim,barely visible,roadscholar that was my first thoughts too I will check all conections,not just the earths.thanks lads as always great advise chris.
 
May be of use? I've just been through something similar (thanks again Alan ;-) ), we noticed that my assimilator box (Mk III/ES) was not dimming until revs were around 5+k RPM, the output on multimeter was healthy @ lower RPM - fixed by replacing assimilator with a spare & it now the charge light dims & goes out around by +/- 3k RPM .

I plan to get a status monitor asap as they provide more info.

Cheers, Mike (with an early Boyer).
 
I have a spare assimilator and plenty of call to suspect the original. Can anyone provide a pic, drawing, or instructions as to the connections so I can confirm this when I swap them out? I must at least have the ground connection correct because the light does come on.
 
Mike Sullivan said:
fixed by replacing assimilator with a spare & it now the charge light dims & goes out around by +/- 3k RPM.
Click to expand...

Mine (also Mk3 assimilator) goes out at about half that figure.


Danno said:
I have a spare assimilator and plenty of call to suspect the original. Can anyone provide a pic, drawing, or instructions as to the connections so I can confirm this when I swap them out? I must at least have the ground connection correct because the light does come on.
Click to expand...

Three pin (silver can)?

Terminals marked:
'WL' (Warning light) = White/brown (WN)
'AL' (Alternator) = Green/yellow (GY)
'E' (Earth) = Red

Later Mk3 (Non-Canadian)

IGN = White (W)
AL = Green/yellow (GY)
AL = White/green (WG)
WL = White/brown (WN)
E = Red (R)
 
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update,mike ive only been blipping the throttle nowhere near 5 thou,i was going to check conections while battery was charging but I would,nt have known what cracked it,so I charged the battery,13.18 volts when full,ignition only on started second kick pressed headlight flasher then horn,it didn't try to cut the engine but light was still on very dim,turned headlight,taillight ,indicators, headlamp flasher and brake lights all at once and the light went out completely,was the battery too low to start with or could it be something else, chris
 
chris plant said:
ive only been blipping the throttle nowhere near 5 thou,i was going to check conections while battery was charging but I would,nt have known what cracked it,so I charged the battery,13.18 volts when full,ignition only on started second kick pressed headlight flasher then horn,it didn't try to cut the engine but light was still on very dim,turned headlight,taillight ,indicators, headlamp flasher and brake lights all at once and the light went out completely,was the battery too low to start with or could it be something else,
Click to expand...



All the assimilator actually does is switch the charge warning light off when it senses a certain level of AC output from the stator.
It is not a 'charge' or 'voltage' indicator so it tells you nothing about DC system voltage or the battery's state of charge.
 
I purchased one of these tri color charge warning LED lights from www.improvingclassicmotorcycles.com . Its pretty cheap, works as describes, and keeps my informed on the state of my charging system while riding.


From the website......
The Universal fit Charge Warning light with 10mm TRI-colour LED - £11.55
The Tri-colour CWL voltage/colour map is as follows:- less than 11.1V = slow red flash, 11.1V - 12.6V = steady red, 12.6V - 15.4V = steady green, 15.4V - 16.1V = steady yellow, above 16.1V = eye catching yellow flash sequence

Cheers,
Gatsby
 
L.A.B. said:
Mine (also Mk3 assimilator) goes out at about half that figure.




Three pin (silver can)?

Terminals marked:
'WL' (Warning light) = White/brown (WN)
'AL' (Alternator) = Green/yellow (GY)
'E' (Earth) = Red

Later Mk3 (Non-Canadian)

IGN = White (W)
AL = Green/yellow (GY)
AL = White/green (WG)
WL = White/brown (WN)
E = Red (R)
Click to expand...


Yes three-pin, thanks. I will check the spare for the markings.
 
Danno said:
Yes three-pin, thanks. I will check the spare for the markings.
Click to expand...


charging light
 
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