Testing Alternator and R/R?

[daveyrach]

Am i right in thinking I test the alternator output by unplugging it from the R/R and testing the voltage across the 3 pins (1&3, 2&3 and 1&2) this should be tested in AC (V~) on the multimeter and should be 60v-70v??

This is where I get confused, do i test the R/R/Battery in DC and it should be 14v+ at 5000rpm?

If any of you read my thread earlier in the week I broke down and the RAC diagnosed the R/R.

Any help or advice would be greatly appreciated.

[Steve]

test the rectifier in DC. mu manual says 13.5-15.5@5000 rpm.
it says alternator output 70vAC min @ 5000 rpm.
(curvy) 99-02

[daveyrach]

Excellent just the confirmation i wanted!! Cheers

[Kilted Ginger]

if u are using a meter with multiple voltage selectors, start high and come down the way. ie if you expect 60 - 70 v ac, start it on a 200v range.

[daveyrach]

Replaced the R/R today, before replacing test said I was getting 70v+ from the alternator on 1&2, 1&3 and 2&3, so it looks like thats OK. The R/R was reading 11.9v constant.

After replacing the R/R i was getting the following

Lights on:
Idle 13.9v
5000rpm 13.2v

Lights off:
Idle 13.9v
5000rpm 13.6v

Is this the prob fixed? The manual says between 13.5 & 15.5v @ 5000rpm which i have, i'm just worried that its only just over so may break down again.

I dnt know if it makes any difference but i always ride with my lights on.

I HATE ELECTRICS

[daveyrach]

Development

Testing the output of the R/R on the red and black wire coming out shows the voltage going up to 14.2v at 5000rpm but at the battery it drops to from 13.9 to 13.3 what could cause this, i really need help.

[Geodude]

Possible bad earth?

[Geodude]

Have you ever had a read through Nadines thread (http://forums.sv650.org/showthread.php?t=103259) its a monster read but its got a good check list etc.

[daveyrach]

I tried the wires direct form the battery to the R/R as mentioned in your thread but no change, would the fact the battery is not fully charged make a difference as I put it on charge and hour ago and its still charging! Will test again when fully charged.

[Geodude]

I would do the checks again when you have a fully charged battery, just to be sure. I hate electrics aswell bud so your not alone.

[daveyrach]

Output when all is off is already higher I think charging battery may make a difference.

[daveyrach]

Revised measurements

Battery is now fully charged I am getting:

All off: 13.8v

Lights ON
Idle 14.1v
5000rpm 13.8v

Lights OFF
Idle 13.9v
5000rpm 13.5v

Does this seem OK or is it likely to die on me again?

[beabert]

Looks fine. The all off value will settle after a few hours after being switch off, so dont worry when its drops back down to 12.7 ish.

[Sid Squid]

Possible bad earth?
Aaarrrggghhhh!

That is all.

[Geodude]

Why argh sid? my charging fault turned out to be a bad earth.

Edit: Just noticed your sig quote 'Probleme du jour: A bad earth.' i understand now ;)