ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Al Hildenbrand - Minneapolis - obituary
by Bill Addiss - 02/03/23 07:38 PM
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 13 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jun 2019
Posts: 2
K
Khombo Offline OP
New Member
I am currently troubleshooting my daytime running light circuit. I have provided a detailed diagram of the steps I have already taken to isolate my problem. As of right now I have verified power across my DRL Relay pins 86 and 85 (Hot in Run or Start), verified power from the relay to the body control module, verified power across DRL fuse 10A (Hot At All Times) and up to pin 30 (Common) on the DRL Relay. I have also verified continuity across Pins 30 (commmon) and 87a (NC) when vehicle is NOT in Run or Start. When the vehicle is in Run or Start I have approximately 13.6V on pins 30, 85 and 86; on pin 87 (NO) I am only receiving approximately 4V. I have verified 4 like relays with a 12V power supply and all the relays function properly and the single pole functions properly between the double throw.

I am looking for some explanation to why I am only receiving 4V across the relay while installed. I have verified the same relay with a 12V power supply to function properly.

https://mail.google.com/mail/u/0?ui=2&ik=ecb32e1439&attid=0.1&permmsgid=msg-a:r-7935829742791421078&th=16b38ed6e4a5ae48&view=att&disp=safe&realattid=16b38ed4d7189488f941

Joined: Nov 2005
Posts: 827
J
Member
If you're stating that you are reading 4 volts across the common and N.O. contact, that would indicate that you have 2 or more times your meter's input resistance between the relay common and your chassis ground. Assuming a negative chassis ground, pull the relay and measure resistance between the N.O. contact and battery negative. Check the connection at the relay socket and the condition of the DRL ground connection.
Joe

Joined: Jun 2019
Posts: 2
K
Khombo Offline OP
New Member
I went back outside a while ago and i must have taken a wrong measurement somewhere. I am receiving 12-13v on pin 30 (common) and 0v on pin 87 (NO). I am at a loss where to continue to troubleshoot after i have already verified 4 other relays to include the one I am using.

Joined: Jul 2004
Posts: 9,788
Likes: 14
G
Member
Measure the voltage between the common and N/O. With the relay energized that should be very close to zero (a very small fraction of a volt, ideally zero), With it open you should see the full voltage in the load circuit.


Greg Fretwell

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
akmaster
akmaster
alaska
Posts: 75
Joined: June 2012
Top Posters(30 Days)
triple 3
BigB 3
Popular Topics(Views)
303,153 Are you busy
232,167 Re: Forum
216,900 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5