1989 1200 won't charge!

merlin480 · L Plate Warrior Joined: 16 Aug 2020 Karma :

Hello guys! looking to the Gods of the FJ universe for some help. I have an 89 1200, the bike fell off the sidestand yesterday and cracked the stator cover. Not a problem I have a spare. however the bike stopped charging. When I removed the cover, everything looks fine, the only issue I can find is that there is a small magnetic switch that reads small protrusions on the wheel attached to the crank. My issue with this switch is that the resistance across the switch reads the same whether it is in contact with a protrusion or not. I cannot even find a reference to this switch in my Clymer manual. Please help!!

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

""" small magnetic switch that reads small protrusions on the wheel attached to the crank. My issue with this switch is that the resistance across the switch reads the same whether it is in contact with a protrusion or not."""
Pics please.

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Sounds like you're talking about the hall effect sensor/ignition pick-up coil. It doesn't ever touch the trigger wheel, just sits close to it. It is triggered to produce a small electrical charge (signal) based on the protusions on the trigger wheel spinning past it.

Hopefully workshop manual will give you the proper clearance from the trigger wheel. Generally you want it very close, but not touching. Sort of thing you set with a feeler gauge.

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

I thought FJ1200 had alternators not stators?
would pics kill ya?
I mean, is there anybody who doesn't have a phone/camera nowdays?

Also if it was an ignition trigger and it broke,
how could he run the motor to discover it wasnt charging?

This is the ass end of an FJ alternator mounted above the
'stator cover' where the pimple switch err I mean pulse generator is

The impact may have cracked a solder joint on the diode pack
or damaged the brush holder

https://www.bilder01.mcr-dortmund.de/19749-5.jpg

4/10 must do better
____________________
bikers smell of wee

merlin480 · L Plate Warrior Joined: 16 Aug 2020 Karma :

Here are a couple pictures. I have the Clymer manual for this bike ( which I have owned since 2003) there is no mention of this sensor in the manual.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

Is that a sheared off bolt bottom left of the trigger?
____________________
bikers smell of wee

merlin480 · L Plate Warrior Joined: 16 Aug 2020 Karma :

Yes WD Forte that is a broken bolt. I have left hand drills and easy outs, That will be no issue. My question remains if this sensor has the same resistance across it regardless of whether it is near metal or not then what is it's purpose? If it is attached to the charging system it must have some function of charging.

Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

Merlin
To sum up:
Apart from fixing the sheared bolt, forget that area
If the bike runs, its fine.
Your problem is in the alternator mounted above and behind the cylinder block
or, as said above and if you're lucky, a bad connection due to shock/impact.

The lead from the alternator probably goes to somewhere around the starter solenoid and main fuse block and battery.
I'd check clean all these then test again before taking the alternator apart.

Incidentally
lets call it the 'Timing cover' to avoid further confusion
you dont have a stator.
____________________
bikers smell of wee