Merc V6 135hp 1993

[AndyL]

Suspect Voltage regulator failing as pushing out 16.5 Volts. Does anyone know what the resistance measurements should be on the input/output leads so that I can check them. Thanks.

 

[gw204]

Re: Merc V6 135hp 1993

Andy, how did you notice the 16.5 V? I just asked the same question about my 1985 Merc. 150. I noticed sporadic 16.5 V after installing a new fish finder that reads battery voltage. My motor doesn't have a voltage regulator, just a rectifier that transforms AC voltage into DC voltage. Your 135 is/was basically the same exact motor as my 150. There may have been some electrical system updates between 1985 and 1993 but I wanted to offer my recent experience. So, you may or may not have a regulator. Here are some previous posts that could provide you with some info.<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=001578 <br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=014166 <br /><br />To touch on the regulator subject again, a question for the Merc. experts. What's the proper method to add a voltage regulator to a system with only a rectifier?<br /><br />Brina

 

[AndyL]

Re: Merc V6 135hp 1993

Many thanks for reply. I found out the same way as you as have just fitted a Furuno e/s which physically alarms at 16.5volts. There are 2 voltage regs on my engine and by disconnecting one and running it with an avo on the battery the fault was traced to the upper one. Voltage when just the bottom one in circuit was steady 13.8V. Have purchased new unit (£150) but was keen to test the old one even though it is a sealed unit.