How do you know which side to use as positive?

Generally the positive terminal on an aftermarket speaker is the skinny terminal, the wider/fatter one is the negative.

Will this fit a 2018 Mazda 3?

I don't know. If you go to the mazda website or an oem parts site, they have diagrams for each vehicle with part numbers. These connectors are super specific, and I had to buy these as my second pass for my daughter's ford focus. lol

I was reccomended this peice for my 2013 ford fusion by a best buy car specialist at an actual bestbuy. Here it says it wont fit my car. Should i buy?

Same issue here. Crutchfield recommended this piece for my 2014 ford escape but amazon says it wont fit. I may pay the extra dollar and get it at Walmart so if it doesn't fit I can take it back.

Do they work for 2014 explorer?

I'm not 100% positive, but I don't see why not.

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72-5602 4-Way Speaker Harness Connector for Ford Mazda Vehicles

Product ID: 347912650

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Details

Brand
Metra
Item Weight
9 g
UPC
086429287192
Global Trade Identification Number

⚡Plug-and-play installation, no wiring hassle

🔌4-way speaker harness connector

🚗Compatible with Ford & Mazda 2010+ models

Description

🔊 Elevate your ride’s sound—connect like a pro, drive like a boss!

UPGRADE YOUR SOUND GAME - Unlock crystal-clear audio performance with a professional-grade harness.
PLUG AND PLAY SIMPLICITY - Skip the complex wiring—install in minutes and get back on the road faster.
SEAMLESS 4 WAY CONNECTIVITY - Effortlessly link your vehicle’s speakers with precision and reliability.
LIGHTWEIGHT DURABLE DESIGN - At just 9 grams, it’s built to last without adding bulk or weight.
TAILORED FOR FORD MAZDA 2010 - Perfectly engineered to fit your ride’s exact speaker wiring needs.

The Metra 72-5602 is a lightweight, 4-way speaker harness connector designed specifically for Ford and Mazda vehicles from 2010 onward. It offers a plug-and-play solution that simplifies speaker wiring upgrades, ensuring a secure and reliable connection for enhanced audio performance.

Specifications

Brand	Metra
Model	72-5602
Item model number	72-5602
Batteries Included	No
Batteries Required	No
Does it contain liquid?	No
Item Weight	9.07 g

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