Thread Tools Search this Thread Display Modes
Old 10-20-2013, 02:15 PM   #1
2 Rivet Member
Tampa , Florida
Join Date: Oct 2010
Posts: 36
Images: 2
Water pump electrics HELP (safari '64)

When I have both switches on the attached image to 'battery' the water pump (from the tank) works fine as do the interior lights (as its 12V DC), but not, obviously, the Air conditioning unit.
When both switches are to 'City power' the pump appears to be getting 20V 'AC' when activated ... so just buzzes and heats up!!!.
SO ... if I want to use the pump from the tank and the AirCon unit at the same time, it appears when I use the 110v input (from home power or Generator) and put the switches to 'battery' I get the pump working fine from the battery (12V DC) as well as the interior lights (12v DV) but the Air conditioner works from the 110v input and the wall sockets are live (110v)
Is this normal? .. if it is I can live with it but if its a PO issue and I have to get a new univolt or the like that would be frightening. I have replaced back area, axle, figured out electrics, plumbing, water and prone including getting rid of furnace and water boiler and am nearly good to go .... PLEASE tell me this is kind of normal and doesn't need immediate attention .... MANY THANKS Rob

Robert Burns is offline   Reply With Quote
Old 10-20-2013, 03:09 PM   #2
Rivet Master
TG Twinkie's Avatar
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,259
Images: 2
Blog Entries: 5
Don't know what year your coach is. But what you describe is not normal. The DC water pump will not run on AC POWER.
The outlets should only provide 120 volt power when you are plugged in to shore power or on generator power. UNLESS you have an INVERTER as well as a CONVERTER.

Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 10-20-2013, 03:30 PM   #3
2 Rivet Member
Tampa , Florida
Join Date: Oct 2010
Posts: 36
Images: 2
image that did not load before

Hope this helps in my dilemma
My safari is 1964 ... the pump IS 12V DC ... and works when switches are to 'battery' but whenever the switches are to 'city power' the water pump does NOT work ... should there not be a conversion from the mains AC to 12V DC to run the pump even though it is on 'city' mode ... or am I mistaken
Attached Images
Robert Burns is offline   Reply With Quote
Old 10-21-2013, 06:26 PM   #4
Moderator Emeritus
overlander64's Avatar
1964 26' Overlander
1978 Argosy Minuet 6.0 Metre
Anna , Illinois
Join Date: Sep 2002
Posts: 5,396
Images: 183
Send a message via Yahoo to overlander64
Water pump electrics HELP (Safari 1964)

Greetings Rob!

You likely have a problem that is the result of the unusual wiring scheme that was used in 1964 . . . the first year for the standard Univolt. From your photos, it appears that you may have an electrical system that is close to stock. In 1964, the roof vent fans, furnace blower motor, and water pump motor were all connected to transformers that provided 18-Volts DC when connected to 120-volt power. I suspect that a previous owner may have simply cut the wires on the original water pump and installed a new 12-volt DC pump. When operating on battery power no problems . . . when 120-volt AC is connected the 12-volt now becomes 18-volts +/- producing problems. If your coach has the original PAR (Peters and Russell pump), it shouldn't have any problems operating on 18-Volts DC unless its motor has been replaced with a modern motor that isn't rated for 18-Volts+. The solution may be to wire in a resistor or step-down transformer that will reduce the 18+ Volts DC to 12-Volts DC. I believe that this condition was unique to the 1964s as well as a few 1965 Airstreams. Installing a modern 12-volt three-stage power converter charger may also be a solution as the original Univolt wasn't supposed to produce more than 18-Volts DC when connected to 120-Volts AC.

Good luck with your investigation!

Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
AIR #827
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)
overlander64 is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:23 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.