Charge from 6hp Tohatsu

Discussion in 'OnBoard Electronics & Controls' started by 23feet, Jun 19, 2015.

  1. 23feet
    Joined: Dec 2014
    Posts: 63
    Likes: 8, Points: 8, Legacy Rep: 10
    Location: Bay Area

    23feet Junior Member

    OK, I should chip in here as the original poster. I have become familiar with the idiosyncrasies of the Tohatsu charging over time and (sometimes) with helpful advice from others. The sail pro has a rectifier and alternator that charges up to 5 amps. The equipment is robust, and the only problems I have had are from bad connections (my fault) and ignorant misuse of multimeters (my fault). The funky voltage reading with a multimeter is "normal". The only way to read the amperage is the conventional test of disconnecting the positive wire to battery and clipping in the multimeter in series (one lead to positive disconnected battery wire and one lead completing the circuit to battery). With the multimeter in series it reveals that the sail pro charger produces around 4 amps even at low revs, and increases to about 4.8 amps at high revs - in other words it works great. The standard supplied alternator output wires do NOT have to be connected to the battery - nothing happens if they are not. I once did the ignorant noobie mistake of reading the amperage directly from the output wires to my multimeter (that is, short circuiting the charge current). It blew the fuse in my multimeter. Note that there is a 10 amp fuse on the outboard charge output that can also blow if you cause a short. Hope this helps.
     

  2. paul_ap
    Joined: Feb 2020
    Posts: 2
    Likes: 0, Points: 1
    Location: Greece

    paul_ap New Member

    I tend to agree. I wrote to the factory in Japan hoping for an authoritative response, but sadly they forwarded my question to the local importer so that I would get a local answer. Their answer was that it is 'suggested' that the wires always be connected to a battery, for the avoidance of possible problems.
    I did get confirmation that the output voltage is regulated, however (this is also confirmed by Tohatsu USA).
     
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