1982 90 hp v-4 voltage regulator

baiwan

Petty Officer 2nd Class
Joined
Jan 19, 2009
Messages
148
I was wondering how the Vregulator works; it is connected to stator (yellow cableq minus and I couldn't trace the purple cable - most ptobably to ignition key, could regulator cause damage to stator, and how can I check it without engine runung?
 

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 1982 90 hp v-4 voltage regulator

The voltage rectifier is a system of diodes allowing voltage to run in only one direction, away from the stator. It converts ac to dc by blocking the alternate flow.

If damaged, the diodes' wires may fuse and allow battery voltage to reach the ignition system and cause damage, especially to the stator.

There are tests for regulated and unregulated rectifiers in the Engine FAQ forum, but the bottom line is that if you think the rectifier is not good, disconnect it - you don't need it to run the motor. http://forums.iboats.com/showthread.php?t=190638
http://forums.iboats.com/showthread.php?t=190636

The tachometer gets positive and negative (black and purple wires) from the ignition switch and the signal comes from the terminal block on the engine through the gray wire: http://www.maxrules.com/graphics/omc_pics/REMCONTBOX.jpg
 

baiwan

Petty Officer 2nd Class
Joined
Jan 19, 2009
Messages
148
Re: 1982 90 hp v-4 voltage regulator

On my motor the rectefier is a separate unit from the regulator, rectifier is ok, I doubt the regulator.
If I can see an engine wiring diagram.
The rectifier is connected two yellow to stator and minus to body and red to fuse.
The regulator is connected black - minus, 1 yellow to stator and one purple which goes in wiring harness and I can't trace,
I want to check regulator.
Will tacho work connected to 1 lead of stator, with rectifier and regulator disconnected?
 

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 1982 90 hp v-4 voltage regulator

Tach will work with the regulator disconnected but the rectifier must be connected and working properly.

Voltage readings at the battery will vary if the regulator is on or off - use 1500 RPM +/-.
 

baiwan

Petty Officer 2nd Class
Joined
Jan 19, 2009
Messages
148
Re: 1982 90 hp v-4 voltage regulator

I didn't have readings with a blown stator I guess and want to check up regulator before burning the new stator.
How can I do it and how does the regulator work?
 
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