Batteries not charging

[1975fflh]

:oGreetings gods of fishing and related wisdom :o

I have a 1998/99 90hp Johnson and when i have put a multimeter on the batteries with the motor running a bit above idle the volts do not change.

and the Tacho does not work

However when i turn the batteries off the motor will continue to run quite happily.

Does this mean the regulator or rectifier is Kaput are they easy to change with a basic knowledge (the wife tells me I am very basic ;D) or is it a million dollar service fee for the boat shop.

Thanks

[blaze]

If someone in ausfish land or if you knowany one with a manual, the manual will tell you what wires to test to diagnose your fault. My johno book will be way to eary for you.
cheers
blaze
ps
Garry may be able to help you

[Roughasguts]

I think the rectifier is a gonner.
Strange duel battery setups seem to do that to em.

[Spaniard_King]

Yep definately sounds like a rectifier....no tacho is a give away