Weird charging problems

[posplayr]

1. with the sense wire connected directly to the batt positive:
tested at 2000rpm (charging measured at the battery):

- headlight OFF = 14.30V
- headlight ON = 14.15V


2. with the sense wire on the main (orange) switched wire:

- headlight OFF = 14.7V
- headlight ON = 15.3V


i was referring to the handlebars switches asuming they would be a major contribution to the voltage drop at the sense wire when i turn the headlight ON

OK looks like you are close enough that if you just get yore connections clean you will be fine . Voltage drop means resistance and causes the differenecs between the R/R output and the battery output. U are close enough that the R/R output probably doesn't change as the various combinations you have described at the battery. :-\\\

Keep up the good work.

 

[Guest]

OK looks like you are close enough that if you just get yore connections clean you will be fine .
U are close enough that the R/R output probably doesn't change as the various combinations you have described at the battery.

a bit of humor's always welcome

i promise to post a pic of the new fuse box. it's all so tidy that i would hate to move the sense wire to the battery and disturb my new pristine setup

i'll keep attending to cleaning the connectors as i work on the bike, i may be able to further improve the results, but i dont fancy opening the handlebar switches AGAIN (i cleaned and greased them recently, but i think the push-springs might be weak and making for poor contacts).

i'll keep an eye on the electrolyte level at the battery and take it from there. if it starts dropping i can take that to mean that battery is being cooked, right?

as long as there's no danger to the RR and stator, i'm happy to risk a battery :-#

 

[Matchless]

Psyguy, I think I may be confused now as the handle bar switches should have nothing to do with your voltage sensing or voltage drop.

If you follow the battery feed from the battery, heavy red to starter solenoid, fusable sleeved red wire to the fuse box (unswitched), then a 15A fuse with a red wire going to the ignition switch - this is the unswitched battery feed.

Then from the igition switch there is an orange wire going back to the fuse box and terminates on the ganged side of a couple of 10A fuses - this is the switched battery and you should have your sense wire connected here, not on any of the orange wires going out of the 10A fuses. From your replies you have this done.

The only switch that can then be causing this problem could be your ignition switch unless you have a wire connection issue in the above red and orange wires.

With the bike running just measure the voltage between the ground on the battery terminal and the 15A fuse red wire going to the ignition switch and the orange wire coming back from the ignition switch and see if there is a significant difference with lights on and off.

I have never opened one and cleaned it, but consider that your lights also go through it and the more voltage drop there is the hotter the contacts may be getting, thus a clean up or replacement would be a good idea.

Your tests have proven the R/R to be in perfect condition as 14.2 V is a good charging point. Your stator seems to be good as well. It is just your sense point that needs to be corrected and I would rather try to get it down from 15.3V to 14.2V or closer to it.

 

[Guest]

Then from the igition switch there is an orange wire going back to the fuse box and terminates on the ganged side of a couple of 10A fuses - this is the switched battery and you should have your sense wire connected here, not on any of the orange wires going out of the 10A fuses. From your replies you have this done.

yup, that's where the sense wire is connected to.

With the bike running just measure the voltage between the ground on the battery terminal and the 15A fuse red wire going to the ignition switch and the orange wire coming back from the ignition switch and see if there is a significant difference with lights on and off.

ok, i'll do this.


my thinking was that with the headlight ON there a quite a few additional connectors involved (compared when the healight is OFF) and that they would all be contributing to the voltage loss at the sense wire when the headlight is ON. is that not correct?

 

[Matchless]

my thinking was that with the headlight ON there a quite a few additional connectors involved (compared when the healight is OFF) and that they would all be contributing to the voltage loss at the sense wire when the headlight is ON. is that not correct?

No or rather yes in a way. Basically each bad connection or switch acts as a resistance and can be seen as such for simplicity sake. A resistor is what its name indicates, resistance to current flow.

Multiple resistances in series act as voltage dividers and in your case the ignition switch and main fuse is in series with the load, thereafter any additional load switched on, is switched in parallel with the parts of load, (ignitor and coils in parallel with the headlights). The load resistance thus becomes smaller and more current is drawn via the battery and the ignition switch and main fuse that are in series.

If the ignition switch has a resistance, then as total current to bike load rises through it, so the voltage drop across it increases. In actual fact anything happening on the load side will affect the current which in turn affects the voltage drop.

If any of the load parts (i.e. headlights) also has a switch or connector with a bit of resistance then a voltage drop will also be measured across that switch or connector, but that voltage drop is just going to be determined by the current draw of the headlight and the size of the resistance formed by the light switch contacts. In actual fact that resistance actually reduces current flow, meaning that less current is drawn via the main fuse and ignition switch, maybe only measured in milli Amps, but still a reduction.

Basically what I am saying in short is that your load is in series with your ignition switch and main fuse, and is dynamic, meaning it changes as per current requirements, and when drawing your maximum load with all components drawing power you will have the maximum current flowing through the ignition switch, giving you the maximum voltage drop over it. The voltage drop across the light switch is is not going to "add" anything noticeable to your ignition switch drop, but if you put the lights on and push the brake pedal and switch the flashers on at the same time it sure will.

The theoretic ideal is that a switch and a fuse should behave the same as a length of wire and have zero resistance to the current flowing through it. In practice even a length of wire has some resitance, depending on its diameter and length.

Maybe posplayer will chime in here as he is good at explaining the "finer" details in more detail.

 

[Guest]

Basically what I am saying in short is that your load is in series with your ignition switch and main fuse, and is dynamic, meaning it changes as per current requirements, and when drawing your maximum load with all components drawing power you will have the maximum current flowing through the ignition switch, giving you the maximum voltage drop over it. The voltage drop across the light switch is is not going to "add" anything noticeable to your ignition switch drop,

thanks for the tutorial, matchless . it does make sense to me now, as i do know the difference between electrical components being in series vs in parallel

in essence, with the instalation of the new fuse block and corresponding connectors the voltage drop that i have at the orange wire is there mainly due to the ignition switch, right?

if so, i wouldn't mind replacing the ignition switch with a new unit down the line. i just don't like replacing parts before understanding why i would be doing it.

but i'll take those voltage drop readings, that you mentioned, first.

cheers

 

[Matchless]

but i'll take those voltage drop readings, that you mentioned, first.

cheers

Yes first prove that it is actually the ignition switch and maybe you could even clean the contacts although I have never done that and not sure if you can open it.

Apologies, did not mean to be too pedantic in my 'tutorial'. Actually your question was a very good one and I had to give it some thought as to how to reply without going into calculations etc.

If you can reproduce that voltage drop then do the same measurement across the orange and red wires on the ignition switch itself. You do still have the plug connectors in the circuit as well, carrying the orange and red wires which could also be contributing to it.

Or else you can just temporary 'hotwire' the bike and so bypass the ignition switch and test if the drop is still present.

Keep well.

 

[Matchless]

In most cases the electronic switch is a seperate part that is affixed in various ways to the bottom of the lock part and can be cleaned and regreased seperately if you can get it apart without damaging it.
The lock part or barrel for the key is another seperate part and by design isolated from the switch part to keep out metal shavings as these parts wear and also to keep out any graphite powder if used to ease the lock working, as well as water entering the barrel.

Strictly speaking any oil in the barrel should not go into the switch part as water will then also find its way in.

The only way to get an old and tired switch (electrical) part working properly again is to open it and inspect for damage or wear, clean and grease it or replace if required.
The metal contacts may also have seperate springs or act as springs and can become corroded over time. Metal fatigue can take its toll as well as burning of the contacts and wear. Sometimes the plastic base holding the contact melts slightly due to heat and loosens the contacts so they do not make proper contact.

In many cases the electrical switch can be swopped back on your old barrel so that your ignition, tank and seat key stays the same.

Warning to any one reading this: Do not try taking an electrical switch apart unless you have a tidy workplace and have made yourself aware of the tiny springs and balls that may jump out never to be seen again! Also taking apart is nothing compared to reassembling some of those!

Sorry, force of habit, maybe too pedantic again!

Edit: JC, sorry my mistake I actually meant I never opened a GS ignition switch.