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Regulator/rectifier FOAK
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I've still got a charging problem on my '95 Pan. It's the old type 28A
alternator, works fine if I don't have the lights on. If I have lights
on, I get a flat battery in short order.
I have checked out the stator/rotor coils' resistances and for shorts -
they all seem ok.
At some point, someone has replaced the reg/rectumfrier with an
SH541-12 and hard wired it in without the troublesome connector. If I
web-search this, the ST1100 is not listed as compatible.
The wiring of this device is not the same as the original one. It has
three yellow wires - connect to the stator for the ac in - no problem.
Two green wires that are both earthed. Two white/red wires that are
connected to batt + (unswitched). Then, it has one black wire that is
connected to a) a switched ignition source (the brake light switch) and
b) one side of the rotor coil. The other side of the rotor coil is
connected to earth.
I've thought and thought about this, it looks to me like it's been
wired up wrong. I think the principle of the reg/rec is that it can
vary the voltage to the rotor coil as required, and therefore the
amount of charging current? The way this is wired up, the rotor coil
gets battery voltage all of the time and that's it.
Does anyone know what the black wire is on the SH541 - is it an input
or an output, and what should it connect to? It's listed as suitable
for VF750 F/S VF750 FD 83-86 CBR1000FH-FJ 87-88 VF1000 F. Anyone got a
circuit diag. of the charging circuit for any of these bikes they could
send me?
If, as it is currently wired with the rotor getting 12v, does that mean
I am getting maximum output from the alternator all of the time? If
this is the case then I'm a bit stuck, cos' it's not supplying enough
current when the lights are on. Or, can the reg/rec supply more than
12v to the rotor coil when it needs to increase the output, in which
case I need to figure out the wiring or get different reg/rec.
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