Relay For electric water pump??
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Registered User
Joined: Oct 1999
Posts: 356
From: Oakland City, IN
Re: Relay For electric water pump??
Any 30 amp DPDT relay you can source will work just fine. I know the pump doesn't PULL 30 amps, but you don't want to undersize a relay. It heats up in use if it's too small. Just get a 30A and have at it 
Dave C.
Dave C.
Registered User
Joined: Dec 1969
Posts: 27,730
From: Little Rock, AR
Re: Relay For electric water pump??
Originally Posted by White Knight
What does "DPDT" mean?
Thanks for the info guys
Thanks for the info guys
Registered User
Joined: Apr 2004
Posts: 396
From: Toledo,Ohio
Re: Relay For electric water pump??
using a dpdt relay allows you to run the power and ground through the relay, all you need imo is a spst relay , i would just run the power wire through the relay, and ground to the engine or battery neg.
if you already have a dpdt relay...you can still use only one of the sets of the contacts , if they burn out ...switch to the other set
if you already have a dpdt relay...you can still use only one of the sets of the contacts , if they burn out ...switch to the other set
Last edited by LT4orbust; Jan 31, 2005 at 05:24 PM.
Registered User
Joined: Oct 1999
Posts: 356
From: Oakland City, IN
Re: Relay For electric water pump??
I like the DPDT for reasons of wanting to source an indicator light from same input line as the actual device, but not on the physical line to the pump. I don't like splices, and the DPDT lets me wire it a little cleaner. It's all personal preference though, as you are absolutely right. You don't need a DPDT, all you need is an SPST. They are indeed a lot easier to find than DPDT relays, and cheaper to boot.
Dave C.
Dave C.
Registered User
Joined: Apr 2004
Posts: 396
From: Toledo,Ohio
Re: Relay For electric water pump??
Originally Posted by CCCCCYA
I like the DPDT for reasons of wanting to source an indicator light from same input line as the actual device, but not on the physical line to the pump. I don't like splices, and the DPDT lets me wire it a little cleaner. It's all personal preference though, as you are absolutely right. You don't need a DPDT, all you need is an SPST. They are indeed a lot easier to find than DPDT relays, and cheaper to boot.
Dave C.
Dave C.
very good idea , the indicator light,
Registered User
Joined: Dec 1969
Posts: 27,730
From: Little Rock, AR
Re: Relay For electric water pump??
Originally Posted by CCCCCYA
I like the DPDT for reasons of wanting to source an indicator light from same input line as the actual device, but not on the physical line to the pump. I don't like splices, and the DPDT lets me wire it a little cleaner. It's all personal preference though, as you are absolutely right. You don't need a DPDT, all you need is an SPST. They are indeed a lot easier to find than DPDT relays, and cheaper to boot.
Dave C.
Dave C.
Registered User
Joined: Sep 1998
Posts: 8,319
From: US 1 Mile Marker 52 in the Florida Keys
Re: Relay For electric water pump??
painless wiring - water pump relay
kindda $$ compared to a DIY relay setup, but at least you know it will work well and look acceptable.
kindda $$ compared to a DIY relay setup, but at least you know it will work well and look acceptable.
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