Here is a video on how you can test a Relay with or without a diagram. I cover 3.4 and 5 pin relays and all you need is a 12v source, a multimeter and a test light.

Multimeter Used in Video:

Test Light Used in the Video:

You may also find these other videos helpful:

How to test an alternator:

How to Test a Car Battery:

How to Find a Parasitic Draw:

How to Replace an Alternator:

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Due to factors beyond the control of Ratchetsand Wrenches, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Ratchetsand Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video’s. Due to factors beyond the control of Ratchetsand Wrenches, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Again Any injury, damage or loss that may result from improper use of tools, equipment, or the information contained in this video is the sole responsibility of the user and not Ratchetsand Wrenches. Source


PCBCart Firm Summary

PCBCart is a China-based quality PC board Fabrication, Assembly and parts sourcing services vendor. Since our foundation in 2005, we’ve helped 1000’s of designers, customers and electronic amateurs, from company to educational organizations, to develop ground breaking applications which transform some and the industry in which they run. Being a customer-driven Printed Circuit Board Fabrication firm, we are dedicated to adhering to the most stringent quality standards in Printed Circuit Board Fabrication and Assembly. We try our very best to make sure that our Printed Circuit Boards fit and transcend specific criteria of each and every one of our clients. Thus far, we’ve served thousands of world-wide gurus and technical engineers with our outstanding Printed Circuit Board. During the process, we’ve established a robust good reputation for top quality, affordable pricing and quick delivery.

A Wide Collection of Printed Circuit Board Service Features

We know that customers and their requires are the primary focus of any booming business. So, we supply a number of tailored choices and client support alternatives to make certain consumers’ requires are going to be met. Our business has worked on this industry for a long period, we are highly skilled in all facets of Printed Circuit Board Fabrication and technology. From quick prototyping , full production, element kitting , full turn-key Assembly to PCB design recommendations, you can rely on us to yield cutting-edge circuit boards manufactures that meet your rigorous standards every step of the way.

Various Products and services to Provide What You Need

Our varied Fabrication capabilities enable us to produce a full product selection, for instance HDI Printed Circuit Board, High-Tg Printed Circuit Board, Thick Copper Printed Circuit Board, Halogen Printed Circuit Board as standard options, and also more specialist capabilities just like Flex Printed Circuit Board, Aluminium based Printed Circuit Board and also Rogers Printed Circuit Board. We’re specialized in producing good quality products at a low-budget price. Having gained ten years expertise in the industry, we comprehend the significant position that PSC parts play in the capabilities of a product. For this reason we go on to advance our production lines to increase our abilities and the accuracy and reliability. Feel free to quote for your made to order circuit boards Fabrication using our web-based Printed Circuit Board Price Calculator and see how we might help at this moment!

Thank you for your curiosity about PCBCart. In case you would like to understand more regarding what precisely our services and capabilities are, do make contact with us by

telephone call +86-571-87013819.


iFast PCB Fabrication

iFastPCB is a Printed Circuit Board (PCB) manufacturer giving you a turn-key solution to the different electronic assembly and low-volume orders. Our services consist of rapid PCB Prototyping, PCB fabricating, plus assembly. Being among the many main China PCB manufacturers, we make an effort to offer world class services to our consumers..

Our center value has been maintained by honesty, effort and a team of expert professionals. We endeavor to support our customers with top notch services and exact outcomes; and for this we are prepared to make all of the possible efforts.

Viewing the following PCB fabricating expertise, and get cost-free a offer with no subscription online, our business is ready for private consulting on your PCB conditions.

What we offer here:

PCB Fabrication Price savings

Gain your printed circuit boards directly from the Chinese PCB plant. We have been providing PCB for quite some time. thanks to the excellent info technology, we’ve constructed strong ERP system that pretty increases the PCB fabricating effectiveness, causing us to be competent to present greatly cost efficient PCB products without ruining the customer’s financial budget.

Speedy Turn-around

Single-sided and 2 layers PCB prototypes, we will ship to you in less than 48 hrs. Further more, the turn-around time depend upon the quantity and layer number.

Awesome Consumer Support
Troubles or requests, we get back to you in under One working day. Our client service team will deal with the your information asap.

PCB Fabrication Capacities

iFastPCB is the turn-key solution to all of the PCB prototyping and fabricating requirements. Positioned in China Shenzhen, we offer the the majority of kinds of modern PCB technologies and PCB prototype services. The Prototype PCB manufactured by us is meant for excellent stability and precision. Supported by our PCB functions, our PCBs are capable to work under demanding surroundings. The formats supported are: Gerber file, .pcb, .pcbdoc, .cam.

Commence with uploading your PCB design file and get a costless quote online. We suggest you to transform the PCB file to one of the encouraged formats before you upload it for quoted price.

Communicate with Us

When you have any questions or merely have a need for our technical support, please leave us a message our mailbox, otherwise call us today +86-755-23091058


ALLPCB Website

ALLPCB is the very first multinational web-based platform with PCB prototyping and small-quantity PCB fab services.
Since 2013, ALLPCB has long been striving to provide the most cost-effective PCB fab service and provide worldwide SMEs with complete PCB design process and tech support from “Prototype to Production”. For you to realize a fast reply to customers’ requires, we now have built a potent service and support system. Our delivery performance, quality control, consumer support and fast reaction to troubles lead to our foremost position in PCB field.

ALLPCB benefits from distinctive resources in several facets:

1. PCB makers

Around A hundred China-based PCB makers have joined ALLPCB manufacturer network, supplying 1 To 30 layers boards for PCB prototyping and small-quantity PCB fab. They include multilayer board, high frequency board, metal core board, HDI board and rigid-flex board. The fastest leading time might be within 24 hours. Every one of the PCB manufacturer members have passed on our stern on-spot audit by professional auditors concerning the environment, equipments, materials, certifications and management. All of the examination information are open and transparent on the net, confirming the manufacture capability genuineness of each and every PCB manufacturer.

2. Parts

ALLPCB cooperates with about 30 widely known components dealers, providing at least 5 million electronic components in store. No less than 95% orders will be sure to be delivered on the same day.

3. PCB Assy

ALLPCB works together with at least 10 PCBA makers with the capacity of prototype and small-quantity manufacture within 2 To 3 days. Additionally, the pass rate of finished products extends to 99.9%.
ALLPCB features a solid team with 100+ client service members and technical engineers . We give 24/7 service for multinational consumers through e-mail message, business phone and real-time chat.
“Made in China, Loved by the entire world” is the goal of ALLPCB these days. ALLPCB is going to try to attain the redevelopment from”Produced in China” to”Produced in the world”, making the advancement of worldwide SMEs less of a challenge and delivering the people significantly better living thanks to technological advances!

Communicate with Us

Location: 12th Floor,West #2 Building, XinTianDi Business Center, #71-8 ShiXiang Road,XiaCheng District, Hangzhou City, China
Mailbox :


HQT Circuit (Shenzhen) Ltd.

HQT Circuit (Shenzhen) Ltd. is a specialized manufacturer for 2-26 layers PCB board. We specialize in quickturn PCB board prototyping, small – medium volume PCB board and PCB board assembly. Established in ’09, situated in Shenzhen , China, with approximately 408 qualified employees and complex gear, we are now able to achieve 20 thousand sqms capacity monthly.

Our firm are recognized by ISO-9001, ISO14000, IPC-A-600, UL certification along with RoHS compliance. Our boards are generally utilized in telecommunications, industrial control, power electronics, medical devices, security electronics, electronic devices, LED, and the like. About 80% of our boards are released to European countries, United States of America, Canada, South America, Australia, South Africa, India, Middle East and the like. For the convenience of clients, we’ve made available one-stop service which include uncovered PCB board fabrication, PCB board assembly, FPC and Stencil for about 2,000 clients world wide.

We pride ourselves on featuring high-quality, huge discounts, awesome service in addition to prompt shipping. We love working in hand with clients to result in a win-win partnership.

Company Summary
We joined in Hong Kong Electronics Fair and Electronica 2016 Munich, Germany.
We’ve supplied premium PCB board manufacturing & PCB board assembly services for at least 2,000 clients.

We went to HK Global Sources Electronics Fair.
We did start to present flexible and Rigid-flex PCB board.
We introduced ERP program.

We We’re certified ISO14001.
We did start to produce 26 layers PCB board.

We did start to offer PCB board assembly and Stencil.
We’re prized as a harmonious labor relations business enterprise.

We’re certified by ISO9001.
We showed up at Hong Kong Electronics Fair.

We had UL certification.
We signed up with CPCA (aka : China Printed Circuit Association).

We acquired RoHS certificate.

HQT Circuit (Shenzhen) Limited commenced in Shenzhen, China Mainland

Communicate with Us

HQT Circuit (Shenzhen) Ltd.
Yitong Technology Shenzhen Co.,Limited

Home office: Room # 208~215, Zhifu Building, Pengda Road, Longgang Dist., Shenzhen , China MainlandManufacturing plant Location : Penglianjia Science Park, Shibi Village, Pingdi Street Office, Longgang Dist., Shenzhen , China Mainland

TEL : +86 755 83393378
Fax : +86 755 83422990
Promoting administrator Mailbox :

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