SAE 2 Pin

Tag: plug

DC Connector Terminology

by on Mar.09, 2012, under Terminology

Whenever one choses to delve into a technical topic, it’s worthwhile to begin with a study of pertinent terminology.  Generally speaking, it won’t be long before you start bumping into terms that are key to gaining an understanding.

The handy SAE 2 Pin connector is a great example.  We all had some exposure to basic electrical concepts in our early years, but not everyone has experienced continued exposure throughout their life.

If you were to begin looking for some information on the SAE 2 Pin connector, you’d probable come by it being described as a type of “DC connector”.   Now many are reminded of the terms AC and DC by the name of one of my favorite bands.  Some people might understand that what they access at a household electrical outlet is AC, and maybe even that AC stands for “alternating current”.  I hesitate to think that very many people actually have a firm grasp on just what “alternating current” means, let alone – “DC”, and “direct current”.

I’m not poking fun at anybody.  Many of us are very knowledgeable about areas of technology without any reason to have this particular knowledge.  An engineer, and the son of an electrician (early in his career), I’ve had quite a bit of exposure to electrical concepts throughout my life.

Direct Current (DC) being that which pertains to the topic of SAE 2 Pin connectors, that will be our focus in this discussion.  Any discussion of DC vs. AC is going to involve explaining that the “direct” vs. “alternating” pertains to the direction of the flow of electric charge.  Direct Current (DC) is the flow of electric charge in one direction.  Alternating Current (AC) is the flow of electric charge in both directions, i.e., “alternating” one then the other.

Alternating Current (AC) is what we access at household electrical outlets, but it also describes that which is produced by an Alternator.  An alternator converts mechanical energy (the belt driven rotation) to electrical energy in the form of alternating current.  An electrical device called a rectifier converts alternating current (which periodically reverses direction), to direct current (which flows in only one direction).  A rectifier produces a type of DC characterized by pulsating voltages and currents.  This type of DC current may then be further modified into the type of relatively constant voltage DC characteristically produced by such sources as batteries and solar cells.  There’s a lot of room for further discussion along these lines.  For our purposes, let’s leave it at the above for now.

As stated above, it is Direct Current (DC) that is produced by a battery.  It is direct current that used to charge batteries, as well.  Most electronic systems employ a DC power supply.  It follows then that a “DC Connector” is an electrical connector used in supplying Direct Current (DC) power.  There are numerous standardized DC Connectors with specific dimensions and configuration to prevent accidental connection of incompatable sources and loads.

An important aspect of a connector is its “Pinout” – which describes the function of its contacts (or “pins”).  That function may be Power (“+” positive, or “-” negative/ground), or Signal related (as in the case of a USB connector with “+” Data and “-” Data contacts).

When it came time for battery maintenance industry leader, Deltran, to select a DC Connector for the output of their Battery Tender line – the SAE 2 Pin connector was no doubt the hands-down choice.  Common in the automotive industry, its selection by battery maintenance equipment manufacturers makes sense.

Most peoples’ likely exposure to the SAE 2 Pin connector probably has to do with its use in trailer light systems.  SAE 2 Pin assemblies can often be found in the trailer lighting section of automotive stores.  Hopkins Manufacturing (the name you’re likely to most often see associated with trailer light wiring products), calls these 2 Pole Flat connector assemblies – Product No. 47965.

It was then likely to follow that upon development of Portable Solar Chargers, the SAE 2 Pin connector was to be the choice.  Industry leader, Global Solar, chose the SAE 2 Pin connector for the output of the majority of their SUNLINQ line of portable solar chargers.  In fact, their 6.5W and 12W models feature a 5-piece SAE 2 Pin accessory cable kit.

These two applications give rise to the next topic – “polarity”.  Polarity being which side of a particular connector is “hot” (+) positive, and which side is (-) negative.

In the case of Battery Tenders, the connector polarity is driven by the necessity for it to be the “protected” female side of the SAE 2 Pole connector at the end of the assembly connected to a vehicle battery to be the “hot” (+) positive side.  Therefore, the exposed pin side of the SAE 2 Pin on the end of a Battery Tender output must be “hot” (+) positve.

Portable Solar Chargers are a different situation, since the solar cells are a power source.  Their output connection must therefore be of the polarity which will have the “protected”  female side of the SAE 2 Pin connection being the “hot” (+) positive.  Accessory assemblies must then be of a polarity in which the exposed male pin of the SAE 2 Pin meant to be plugged into the output connection of a portable solar charger must be the “hot” (+) positve.

Anyone connecting leads in circuits such as those discribed above must be carefully mindful of polarity.  There may even be times when it is necessary to use a multi-tester to confirm polarity.  The continuity test function of a multi-tester can be employed to determine which contact (or pin) on the connector at one end of a lead is mapped to (leads to) which contact on the connector at the other end.

Well, we’ve covered quite a few electrical terms and concepts – enough for now.

In addition to questions of concerns in the form of comments to this Blog post, email is welcome at:

We invite you to visit  for additional information – you’ll find a blog format there too!

Our products are available through our e-commerce website at:  

Solar Capitalist LLC is our sister company handling products such as those discussed above, as well as, Deltran’s line of  Battery Tenders, and Global’s SUNLINQ line Portable Solar Chargers.

Capitalize on the Sun’s Energy !



Leave a Comment :, , , , , , , , , , , , , , , , , , more...

SAE 2 Pin Defined

by on Feb.08, 2012, under Terminology

As indicated by the “SAE” aspect of this connector’s designation, the specifications for this connector were developed by the Society of Automotive Engineers.  Learning that, we are quick to realize this connector was (at least initially) intended for use in automotive industry applications.   Therefore, the SAE 2 Pin Connector was developed for use in DC (Direct Current) circuits – most often 12 Volt DC.  So in the world of electrical connectors, the SAE 2 Pin Connector would be loosely defined as a type of “DC Connector”.

Further defintion of an SAE 2 Pin might include the description “hermaphrodite” two conductor DC connector.  The term “hermaphrodite” is applicable because each connector includes both “male” and “female” components – an exposed “male” pin, and a protected “female” socket.

An SAE 2 Pin Connector is often seen on the output of battery maintenance equipment, such as the industry leader – Deltran Battery Tenders.

Therefore, the associated accessory assemblies are outfitted with an SAE 2 Pin connector of the polarity necessary to carry out the intended function.  For example, a Deltran Battery Tender “Quick Connect” assembly, to which a Battery Tender output can be coupled to maintain a motorcycle 12V battery’s charge during periods of little or no use.

Thus far in this post, we have focused on the term “SAE 2 Pin”, but this connector is often given other names – SAE 2 Prong, SAE 2 Pole, SAE 2 Conductor, 2 Pole Flat Trailer Connector, etc.  It’s pretty clear that “SAE 2 Pin’ is indeed the appropriate terminology, based on the connector’s specification developer (SAE – Society of Automotive Engineers) and this term’s consistant use.


The SAE 2 Pin connector has surfaced as the predominant choice in the portable solar charger industry, as well.  For example, Global Solar’s SUNLINQ 6.5 and 12 Watt portable solar chargers have an SAE 2 Pin connector on their output cable.  The associated accessory kit consists of 5 cable assemblies with SAE 2 Pin connectors.  The polarity of these assemblies is specific to their use coupled to the output of the 6.5W or 12W portable solar charger.

Deltran’s 5W, 10W & 15W Solar Panel powered Battery Tenders feature and SAE 2 Pin output, as well.

The predominance of the SAE 2 Pin connector in 12 Volt DC applications is prompting a growing assortment of cable assemblies and adapters.  For example, SAE 2 Pin x COAX adapters.

SAE 2 Pin connectors are being made available in a wider range of wire gauge, as well.  Heavier AWG leads are facilitating greater current carrying capacities, and thereby use in higher current flow applications.


Your email is welcome at:

We invite you to visit  for additional information – you’ll find a blog format there too!

Our products are available through our e-commerce website at:  

Solar Capitalist LLC is our sister company handling products such as those discussed above.

Capitalize on the Sun’s Energy !

Leave a Comment :, , , , , , , , , , , , , , , , , more...

Hello world!

by on Feb.04, 2012, under News

Welcome to our new SAE 2 Pin website !!!  Created to increase awareness and knowledge of the handy SAE 2 Pin connector, our Blog format facilitates interaction along these lines.

We have several years of experience focusing on SAE 2 Pin connectors, leads, and cable assemblies through our other two websites: and  Where there had been limited attention, we developed and manufactured SAE 2 Pin assemblies with heavier gauge leads (14, 12, and 10 AWG vs. only 18 and 16 AWG).  Worth noting – the high quality SAE 2 Pin assemblies we have developed are manufactured right here in the United States.

It is our mission to post that which we’ve learned, provide this forum through which others may contribute their pertinent knowledge, and have this same forum also allow all to raise questions in the form of posts and comments.  Thereby, making this accumulation of posts and comments available to all those with an interest.  We welcome your active participation!

Always with an eye on that which will please our audience, we are vigilantly watching for emerging needs.  Where a custom SAE 2 Pin connector assembly is required (even with a different connector at the opposite end) please contact us to discuss it’s potential development and production.  We are well prepared to address such opportunities – quickly and efficiently.

Your email is welcome at:

We invite you to visit our  for additional information – you’ll find a blog format there too!

Our products are available through our e-commerce website at:  

Solar Capitalist LLC is our sister company handling products such as those discussed on this website, as well as, Deltran’s line of  Battery Tenders, and Global’s SUNLINQ line Portable Solar Chargers.

Capitalize on the Sun’s Energy !

Leave a Comment :, , , , , , , , , , , , , , , , , , , , more...

Looking for something?

Use the form below to search the site:

Still not finding what you're looking for? Drop a comment on a post or contact us so we can take care of it!

Visit our friends!

A few highly recommended friends...