Good Sam Club Open Roads Forum: 170VAC coming from my Onan generator
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > 170VAC coming from my Onan generator

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 5  
Prev  |  Next
SHRED

California

Full Member

Joined: 12/27/2018

View Profile


Offline
Posted: 02/19/21 03:53pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

SHRED wrote:

I didn't see "regulator" in there.


Might interchange the word governor since it regulates engine speed.

1. Engine governor incorrectly
adjusted


Yes get it in to a pro for best results.


I was trying to avoid that in that they want about $550 just to diagnose the problem at my local Onan/Cummings dealer.

Ugh.


2021 27' Lazy Daze MB... soon!


enblethen

Moses Lake, WA

Senior Member

Joined: 01/05/2005

View Profile






Posted: 02/19/21 04:02pm Link  |  Quote  |  Print  |  Notify Moderator

As Gary said early on, find a meter that reads HZ. This is used to adjust engine speed to adjust HZ and voltage. Voltage should be unloaded around 124-128 volts AC.
Manual

Flight System Has after market good quality replacement parts.

* This post was edited 02/19/21 04:19pm by enblethen *


Bud
USAF Retired
Pace Arrow

2003 Chev Ice Road Tracker


theoldwizard1

SE MI

Senior Member

Joined: 09/07/2010

View Profile


Offline
Posted: 02/19/21 09:33pm Link  |  Quote  |  Print  |  Notify Moderator

Under some circumstances digital volt meters can read "ghost voltage". This typically occurs when there is no voltage at all on the probes but there is voltage in nearby wires. Ghost voltage is usually unreasonably high.

Best solution is to use a very low wattage light bulb across the points you want to test and the meter leads across that. If the high voltage is real it may blow the bulb so be careful !

larry cad

ohio

Senior Member

Joined: 05/23/2004

View Profile





Offline
Posted: 02/20/21 05:19am Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Under some circumstances digital volt meters can read "ghost voltage". This typically occurs when there is no voltage at all on the probes but there is voltage in nearby wires. Ghost voltage is usually unreasonably high.

Best solution is to use a very low wattage light bulb across the points you want to test and the meter leads across that. If the high voltage is real it may blow the bulb so be careful !


Exactly correct!


Today is my personal best for most consecutive days alive.

Our Travel Blog

Gjac

Milford, CT

Senior Member

Joined: 08/16/2006

View Profile



Good Sam RV Club Member

Offline
Posted: 02/20/21 06:59am Link  |  Quote  |  Print  |  Notify Moderator

If the engine governor/regulator is high to cause 170 v you would hear it reving high. First before you take it in, plug your volt meter into your house circuit and see that it reads 120 v or so just to verify meter. Is it reving high? Did you verify your meter is good? There is a company called Flight Systems that have helped me in the past with my Genset and other systems. If you call them 717-590-7330 and describe your problem they can help you fix it. They also have a troubleshooting guide for your genset on line.

SHRED

California

Full Member

Joined: 12/27/2018

View Profile


Offline
Posted: 02/20/21 08:06am Link  |  Quote  |  Print  |  Notify Moderator

Gjac wrote:

If the engine governor/regulator is high to cause 170 v you would hear it reving high. First before you take it in, plug your volt meter into your house circuit and see that it reads 120 v or so just to verify meter. Is it reving high? Did you verify your meter is good? There is a company called Flight Systems that have helped me in the past with my Genset and other systems. If you call them 717-590-7330 and describe your problem they can help you fix it. They also have a troubleshooting guide for your genset on line.


My meter is accurate and the genset is not revving high.
Thanks for the Flight Systems tip.

zigzagrv

Nazareth, PA

Senior Member

Joined: 08/12/2004

View Profile



Good Sam RV Club Member

Offline
Posted: 02/20/21 08:27am Link  |  Quote  |  Print  |  Notify Moderator

This might be comparing apples to oranges, but on my Generac 5500 I had a similar problem. I had driven through a very humid and rainy day. When we pulled in for the night (boondocking) I fired up the generator to make dinner. I always take a glance at the Kill-o-watt to see the output of the gen. It was showing 155 volts.

Long story short, I removed the control panel cover and found a buildup of years of dirt on the regulator module. It almost covered the connection. That plus the excessive humidity was causing a short in the connector. After thoroughly cleaning, fired up the generator and everything was fine.


Ron

2003 Gulf Stream Ultra Supreme 33'
F53 Class A
2013 Ford Edge toad


enblethen

Moses Lake, WA

Senior Member

Joined: 01/05/2005

View Profile






Posted: 02/20/21 09:01am Link  |  Quote  |  Print  |  Notify Moderator

Before calling Flight Systems, get as much information a you can. Exact model and spec number, locate the regulator and get exact numbers off it. Take readings and have them available.
Did you see the linkage to the throttle moving? With genset off, try moving the linkage by hand. Doesn't take much pressure.

dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 02/20/21 09:09am Link  |  Quote  |  Print  |  Notify Moderator

transformer is incorrectly
connected or defective.

This is the "regulator". Doug

Voltage Regula ti ng Transformer
The voltage regulating transformer helps to provide
stable generator output voltage under varying load
conditions. Voltage transformers are constructed
with two primary windings and a single secondary
winding. Each primarywinding (Hl-H2and H3-H4) is
connected in series with one of the generator AC
output windings. The transformer secondary winding
is connected in series with the field current circuit.
Taps on the secondary allow for field current
adjustments.
The voltage regulating transformer mounts on the outside of the generator housing and is enclosed with a
special cover. The cover must be in place during operation for transformer cooling.

dougrainer

Carrolton, Texas

Senior Member

Joined: 06/11/2007

View Profile


Offline
Posted: 02/20/21 09:10am Link  |  Quote  |  Print  |  Notify Moderator

https://onan.xmsi.net/965-0530%20Onan%20........enset%20Service%20manual%20(05-1986).pdf

Page 87. Doug

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 5  
Prev  |  Next

Open Roads Forum  >  Tech Issues

 > 170VAC coming from my Onan generator
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.