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TopiToo
13-Oct-2006, 20:19
Hello

I have been checking a few things, with a multimeter
and as it stands I think the problem could well be
the wiring between the alternator and the regulator.

with a new battery wired up I was getting readings of 13-14.5v at idle
however as soon as I opened the throttle to 3000rpm
the readings moved to 15-16v (and I think I am right in saying at 3000rpm the norm
is 14-14.5V)

so what I would like to know is what is the maximum voltage output of the alternator
the Haynes states 13.5-15.5V, so I guess that in mind my 16V is about right for the alternator.

The increase in V suggest to me that the alternator is powering the bike Not
the regulator, if that makes sense?

(open throttle Speedo, lights etc go haywire) overcharging

I understand as I have done many a time that putting the multimeter
on the battery, to some extent gives unclear readings, as if the alternator
is not charging the battery properly, the battery will run say 50miles before it dies.

so the plan is to check/cut back the alternator wires again, run a fresh set via
the meter/battery and work from there.

I need to know where the power is going, and what’s causing it as it stands the
Rectifier is not in the link, (and after a call to electrex to ask how to check, was told
"our parts never fail its a wiring problem you have") wait and see I know of one DSC member who returned one because faulty.

maybe I am getting some where?:confused:

I hope so just repaired the TV remote after a hot chocolate spill ( and telewest want £12.50 for a replacement) the cheek . . .:lol: :lol: :lol:

regards

TopiToo
TP
13-Oct-2006, 20:26
..
I hope so just repaired the TV remote after a hot chocolate spill ( and telewest want £12.50 for a replacement) the cheek . . .:lol: :lol: :lol:

regards

TopiToo


:lol:

Dear oh dear Steve, at least the remote works again!

Sorry, I can't really help you with your wiring etc, I'm a total numpty when it comes to these things I'm afraid.
TopiToo
13-Oct-2006, 20:41
:lol:

Dear oh dear Steve, at least the remote works again!

Sorry, I can't really help you with your wiring etc, I'm a total numpty when it comes to these things I'm afraid.

Hello TP

the romote is more improtant as it's GP weekend and I stand to will
a kabab (with chips) if Rossi does not win.:)

sad but true . . .:lol:

TopiToo
PeteB
13-Oct-2006, 21:32
Steve,

U2U for the helpline!!
TopiToo
13-Oct-2006, 21:57
Steve,

U2U for the helpline!!

Hello PeteB

will do thanks mate.

I am not very good at expaining myself, but in a round about way
hope I am getting close:)

TopiToo
rockhopper
13-Oct-2006, 22:36
Best bet is to download the fault finding chart from here and follow it step by step.

https://www.electrosport.com/electrosport_fault_finding.html
Jasper
13-Oct-2006, 22:56
I sent a Faulty Reg back.New one worked fine.
TopiToo
14-Oct-2006, 01:27
Best bet is to download the fault finding chart from here and follow it step by step.

https://www.electrosport.com/electrosport_fault_finding.html

Hello rockhopper


Thank you for the link mate

will be working through it in the morning


regards


TopiToo
TopiToo
15-Oct-2006, 12:11
Hello

regulator, is not doing its job again:( charging the battery at 17V

thanks for all the help folks:)


TopiToo
phil_h
15-Oct-2006, 12:21
Do not run the bike if your meter shows 17V !
You will end up damaging something else, as it sounds like the rectifier part that turns the ac into dc is not working, so the peak voltage will be even higher. Peak current will be proportional to peak voltage, so beware !
Also, if your regulator is faulty, you shouldnt run the bike with the battery disconnected for the same reason.
Set your meter to ac to check this. There should be no ac with a battery connected.
Putting 17V onto a battery could damage it and/or the wiring beyond repair.
TopiToo
15-Oct-2006, 12:46
Do not run the bike if your meter shows 17V !
You will end up damaging something else, as it sounds like the rectifier part that turns the ac into dc is not working, so the peak voltage will be even higher. Peak current will be proportional to peak voltage, so beware !
Also, if your regulator is faulty, you shouldnt run the bike with the battery disconnected for the same reason.
Set your meter to ac to check this. There should be no ac with a battery connected.
Putting 17V onto a battery could damage it and/or the wiring beyond repair.

Hello phil_h

Thanks for that, I needed to run the bike to get the readings,
but will not be using it until I can get a new regulator.

not too sure how I would do this though "if your regulator is faulty. you shouldn't run the bike with the battery disconnected for the same reason"

If the battery is diconnected I have no power!!:confused:

TopiToo
phil_h
15-Oct-2006, 16:25
Sorry mate - I meant do not _rev_ the bike. Any voltage over about 15 is a sign of a fault.
Check you have a damn good earth at your regulator btw, as that could give false readings when you have current flowing - any resistance will give a volt drop !
TopiToo
15-Oct-2006, 20:53
Check you have a damn good earth at your regulator btw, as that could give false readings when you have current flowing - any resistance will give a volt drop !

Hello phil_h

The regulator that has failed is a Electrex RR51, this has never been
earthed to my knowlege over the passed 3yrs, saying that my old Duc regulator had an earth.

attaching an earth now, are you saying would give different readings?

TopiToo
phil_h
15-Oct-2006, 21:58
Many regulators use their chassis mount as an earth point, so they can flow high current easily - which sometimes gives problems if you have the frame sprayed ! So to avoid this many have a dedicated earth wire so its obvious, but its not as good a method. I'll go and have a look at how mine is earthed and offer some more specific advice, but you can trust me, it wont work without some kind of earth :)
Shandy
15-Oct-2006, 22:20
I can second what phil_h is saying. The regulator uses the earth connection as a point of reference, without one it won't know what to do.

My monsters got a dedicated cable to the regulator earth, i can have a look at the 916 tomorrow to see how it's done on mine and let you know.
TopiToo
16-Oct-2006, 17:37
I can second what phil_h is saying. The regulator uses the earth connection as a point of reference, without one it won't know what to do.

My monsters got a dedicated cable to the regulator earth, i can have a look at the 916 tomorrow to see how it's done on mine and let you know.

Hello Shandy

That would be great, a pic of this earth would be good
showing to and where it goes.

regards

TopiToo
phil_h
16-Oct-2006, 18:39
Right, I've been in the garage and taken the fairing off to see whats its all like and get you some pix ... and there is no direct earth bond from the regulator to the chassis. I've got a 98 SPS, and the regulator is fixed to a rubber mounted heatsink.

the yellow wires are the ac in from the alternator, the 2 green wires are the earth connection from the regulator which connect to 2 black wires going to earth somewhere via the loom. This connection is very important at both ends, so clean the connector block if it looks corroded. From the wiring diagrams, earlier models look to have just one earth connection and a red/white charge light wire. 2 red wires then feed the rectified, regulated voltage into the wiring loom.
(in the pic i'm holding my external charger lead out of the way)
The second pic is there to remind us all that there is a stupid metal connector that can cause faulty readings fitted on either end of the battery. The terminal you fix the wires to is just a swaged-fit into the metal plate and can be pulled through if you overtighten the nut trying to get a 'better' connection - which makes it a worse connection. I've welded up the backs of mine.
Karl
16-Oct-2006, 19:27
Steve, hope this helps. Just looked looked at my 916 and taken this pic. I have a earth wire going from the regulator/heatsink bolt to the main harness.

http://i.pbase.com/g6/73/571973/2/68680858.uDiumPlG.jpg
keefer
16-Oct-2006, 19:32
same as Karl
so it wanst the batteries fault then hey ?top kit that
Shandy
16-Oct-2006, 19:41
Mine '95 916bp is the same as Karls, wiring heading off into the loom which i assume goes to the battery negative,

http://i80.photobucket.com/albums/j192/ducatimonsterdog/916%20Pics/2006_1016Image0009.jpg

http://i80.photobucket.com/albums/j192/ducatimonsterdog/916%20Pics/Picture003.jpg

I was out in the garage as Karl posted his picture up, wish i never bothered though as i found a few drips of oil coming off the bottom of the engine, ah well thats another thread for another day.

Cheers,

Shandy
phil_h
16-Oct-2006, 20:23
Terribly clean those funny red bikes ... dont you take them out to play ?:devil:
TopiToo
16-Oct-2006, 20:24
Hello

many thanks again one and all.

I need to find that earth:) got a feeling its attached to the negative
terminal on the battery, my mistake:eek:

great pictures though . . .

regards

TopiToo

PS Keefer never thought the battery was at fault, I new it could only
be my wiring, aternator, or rectifier. That battery got me home;)
rockhopper
16-Oct-2006, 20:39
It doesn't matter where the earth goes as long as its not to the positive terminal! Battery is just as good as frame, better in some respects.