Yamaha 60FET charging problem

[gvp90000]

60FET (Model 1985 ?)
6H2 L 350548
===============
In a friend's boat the rectifier - regulator was fried since 2010.
I replace it and the battery and with a clamp Amperometer I measure 0.7A-0.9A maximum charging current.
Peek voltage from lighting coil >40V
All connections are in good condition (I searched for voltage drops ... didn't find any).
Battery voltage in rest condition 12.6V
Battery voltage in 3500-4000 rpm 12.8V

My multimeter is a Fluke 87v and it is very accurate (I test it)

Any idea why ?

[boscoe99]

The maximum current output of a 1985 60 HP Yamaha two stroke is 6 amps at best. At full throttle.

Seeing 0.7 ~ 0.9 amps to a fully charged battery seems reasonable. I don't see a problem. The current flow is going to be a function of the delta between the battery voltage and the R/R output voltage.

Voltage at the battery seems on the low side. You might have a voltage drop issue. Would not be uncommon given the age of the motor. Measure the voltage at the red output lead of the R/R. To a good clean ground point on the block. What is the voltage at a fast idle? I would suspect 14 or so volts.

[fairdeal]

interesting.
less than an amp current isn't that surprising with voltage at the battery of only 12.8

seems the mystery is why the voltage is only 12.8

[rodbolt17]

cause the charging current at WOT is only about 6 amps. if the battery is already charged it will be a lot less.

[Peter van Egmond]

Need some help here, I have a 60hp yamaha 60feto 6h2 1987 model, I have changed the lighting coil the charge coil and the rectifier regulator and it’s still no
t charging, tested ohms reading on all parts and seems I’m chasing my tail as the old ones read pretty much the same, any ideas

[99yam40]

starting your own thread instead of adding onto an old thread is better.
but I would take peak voltage reading like the service manual says