xj 600f regulator

Iv got a 1989 xj600f pre-divvy, and i think the regulator/rectifier is duff, start bike and a good 14v across the battery BUT as soon as you put lights on even the brake light it drops to 11.5v switch lights off and it slowly creeps back to 14v but can take 3-4mins to do so, thought it might of been the battery so i fitted a brand new battery but still the same, iv done a resistance check of the 3 white cables and all are as the haynes says it should be .3-4ohm checked plug connections at rectifier all ok clean.
The rectifier fitted is not the 1 with the ally fins its the small rectangle 1 filled with the black resin and 4 pin plug, attached to a alloy plate, it has 47X-A2 stamped on it, question is will any regulator/rectifier of this resin filled type work, iv seen a few on ebay but they are saying it comes off a xj600n divvy, i thought all the divvys had the regulators with alloy fins !

 

Look in my gallery. My 600 SHOULD have had the 4 pin regulator but somebody butchered the connector an fitted an earlier model that did not work. The early divvys had a 4 terminal regulator and the later divvys had a 5 terminal regulator - like in my gallery, which i got cheaply and used successfully.
Check the body of your regulator has a good earth (Ground).

It might help to add your location so people know which market the bike was built for. (And we like pictures!!!)

 

Does the voltage go up when you rev the engine (with the lights etc on)?
Or does it take time to go back up? Sounds more like brushes than R/R issues. Or maybe the whole generator windings are done. That's an easy check, probably the same section in your manual. ^^

 

This year onwards featured a permanent magnet alternator - so no brushes - just like the SecaII/diversion.

 

Thanks for the info chaps, the tests i did with the meter were done at about 2500rpm, although when the bike is sat ticking over at 1100rpm it still gives a good 14v untill you put lights/brake light on then it just drops to 11.5v ish and at 2500rpm it takes a good 3 mins for the voltage to slowly creep back upto 14v.
Iv tested the windings of the genny by metering across the 3 white cables that come from the genny to the regulator, all within what it says in the manual .3-4ohm so the genny seems ok.
If this motor has no brushes and is the similar to the early divvy then the regulator iv seen on ebay for a divvy might work, its just a regulator for a xj600f is about £30 and the divvy regulator is £15.
I dont seem to have an option to edit my profile ! but im in the UK Redcar near middlesbrough..

 

I reckon a divvy one will be a straight swap - the alternator outputs are nearly identical.

Be careful not to buy a 5 terminal one. It WILL work but you will have to chop the plug off!!

Connections in my gallery.

The only other thing to check is the red wire from the regulator to the battery. Make sure there isnt a high resistance joint.

 

what i found today was the 3 pin plug under the tank for the 3 white cables from the genny had melted across 2 of the terminals in there so iv sorted them out and rewired them 3 but still the same so i think it shorted the rec/regulator which iv ordered a new 1, rechecked after doing the re-wire and across the 3 whites im getting 0.3ohm so that seems ok and at the rec/reg plug at tickover 20v AC and over 2500rpm its 49-50v AC across the 3 whites so genny seems ok, hopefully the new rec/regulator will sort it all out.
And yes this '89 model doesnt have brushes all magnets which is pretty entertainging trying to get the casing off when it has a mind of its own with those magnets lol..