Hi Norm,
Just a clarification: I assume zero (Ohms) actually means zero (short circuit or near enough), and not "no reading" or "or" (overrange) or "----" which indicates infinity (open circuit).
There is 3 types a dual circuit ( I assume this is an A/C D/C type), then there is a tri circuit? don't know what that means and then the third is just listed as a 10 amp In the pics they all look the same. Patrick I can't see anything on this stator that looks like it might be a rectifier to convert it back to D/C
and
Just checking this stator because it is bugging me, I am getting about .8 ohms from the black wire to the frame, zero from the red wire to frame or between red and black so I am thinking this stator may be ok? Anybody have any thoughts on this ?
means AC and DC: Ac for running the lights, DC to charge the battery.
One system has a rectifier (diode) in the plug. There are two wires out of the stator: red for charging the battery through rectification to DC (actually likely just rectified AC) and black for AC running the lights. Return in both is through the chassis/engine block/ground. Just to emphasise: red and black do NOT mean +ve and -ve in this case!
The stator resistances should be measured across the following, deviations indicate a faulty stator:
- red and stator laminations with ground wires connected: continuity (low or zero Ohms)
- red and stator laminations with ground wires disconnected: infinity (open circuit).
- black and stator laminations with ground wires connected: continuity (low or zero Ohms)
- black and stator laminations with ground wires disconnected: infinity (open circuit).
A second system has a fuse with a solid state rectifier for charging. There are two separate wires (unknown colour) with differing plugs. The DC charging wire has a fuse.
The resistances should be measured across the following, deviations indicate a fault:
- fuse and red connector- continuity (low or zero Ohms), this is actually the charging wire
- don't forget to check the fuse too.
The stator resistances should be measured across the following, deviations indicate a faulty stator:
- two pins in connector: continuity (low or zero Ohms).
- each pin in connector and ground: infinity (open circuit)
Haven't gone into tri-circuit or 10 amp as it's getting late. Tri-circuit has two diodes for rectification, one charges the battery + other loads whilst the other rectifies for the lights. Some of the other alternators also have 4-pin connectors, and solid state regulators. Haven't gone into them here either.
Hope this helps,
