Car Repair & Maintenance : How to Check if a Relay Is Bad

There are various types of relays on every vehicle, and they're not all wired in the same way, but the first step would be to go to the fuse box to find the appropriate circuit. Find out how to use one relay to test another with help from an ASE-certified mechanic in this free video on troubleshooting car problems.

Expert: Tom Brintzenhofe
Bio: Tom Brintzenhofe has been a mechanic for more than 17 years.
Filmmaker: Reel Media LLC

Category:

Autos & Vehicles

Tags:

• auto
• repair
• car
• maintenance
• automotive
• troubleshooting
• problems
• radiator
• transmission
• compressor
• overheating

[Amreekan]

Master Mechanic?  So how do we check if a relay is bad? Just replace it with another one?

Not much info here.

[tommytriumph1]

hello world. the best and fastest way to test a relay is. find your horn relay..... honk horn.... if it makes a honk it a good relay........ then put any frikin relay you want to test in the horn relay slot and honk the horn again........ if it honks then its a good relay!!!!!

[zoryadonetsk]

What???

[ilovenickjonasmore13]

This Was a waste of my time. and Mazdabee, Einstein once said "Common sense isn't so common." I Realize its true every dad.

[charles81265]

Relays don't always show that there is a problem until a high current is flowing! that is why it is recommended to check high current circuits with a headlight!

28 Year Master/ L-1 (advanced engine performance) Technician

[louriddle1976]

no wonder he has a busted finger....he is an idiot. swap them out. u truck.

[myspacecomaffwj]

If you're gonna talk for 2.5 minutes at least tell us how that finger got so ugly! ....Brah!

[cds12271]

You talk too much sir lol.

[mazdaabe]

Terrible.....just terrible information. Anybody with a litlle common sense know that

[elzorrocr]

Thanks for such simple explaination. You are a Master Mechanic and did a job putting it simple for average people. Thanks

[kbj76]

@FahimMotoGP  It depends on what relay is bad. If your horn relay is bad, the engine will start but your horn won't work.