C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Strange click/battery drain

Thread Tools
 
Search this Thread
 
Old Sep 16, 2020 | 07:24 PM
  #1  
DWAVette's Avatar
DWAVette
Thread Starter
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: May 2020
Posts: 1,663
Likes: 702
From: Baton Rouge, Louisiana, metro area
Default Strange click/battery drain

Recently purchased a 1999 Vert.
went to crank it today and battery was too weak.
I checked for corrosion on the terminals - they looked fine. I connected the POS terminal.
as I was reconnecting the Neg terminal, I heard a click under the passenger side headlight. Everything was off in the car, key out.
I started to pull fuses one at a time from the box near the battery to see if I could determine what system relay was engaging.
Not fog lights
Not headlights.
Not Horn.
Finally I started unplugging the various plugs in that area to see if I could find it that way. Fast forward...
Directly under the passenger headlight, there is a small box with two flat plugs. Each plug has approx 5 or 6 wires. When I unplugged the one toward the center of the car, the click finally stopped when I touched the battery to the Net post. One of the wires is Orange. I posted a poor picture of the plug pulled and socket.

Does anyone know if this supposed to happen?
What is that plug for?
I do not have wiring diagrams yet, I just got the car.
Reply
Old Sep 16, 2020 | 07:56 PM
  #2  
DWAVette's Avatar
DWAVette
Thread Starter
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: May 2020
Posts: 1,663
Likes: 702
From: Baton Rouge, Louisiana, metro area
Default Update

More information.
If I disconnect both headlights at the flat gray plugs, and plug the flat plug under the passenger side headlight, the relay click does not happen.
If I plug in either or both headlights, I get that relay click sound under the passenger headlight.
The switch in the car is OFF.
Could this be a “Lights Off Time Delay” and perfectly normal?
Reply
Old Sep 16, 2020 | 08:01 PM
  #3  
DWAVette's Avatar
DWAVette
Thread Starter
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: May 2020
Posts: 1,663
Likes: 702
From: Baton Rouge, Louisiana, metro area
Default Update 2

A little more info.
With the headlights OFF and in the down position, when I touch the battery cable to the battery, I hear the relay click and the passenger side headlight motor rotates a few degrees as if it is trying to lower the headlights.
I think this motor may be continually trying to pull the light down and causing the drain to the battery. when I unplug just the passenger headlight, I still hear the relay click but the motor does not try to spin.
Confused.
Reply
Old Sep 16, 2020 | 08:23 PM
  #4  
DWAVette's Avatar
DWAVette
Thread Starter
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: May 2020
Posts: 1,663
Likes: 702
From: Baton Rouge, Louisiana, metro area
Default Final update

Sorry for the spotty postings. Final for tonight. I am trying to learn this car and want anyone reading to know what I am finding.

I plugged all plugs in.
I pulled both 10amp Headlight Motor fuses.
Touched battery cable, no clicking under the headlight.
So, what ever is closing that relay and trying to spin the passenger side motor is defeated when both fuses are pulled.
I understand that. My question is, is this normal or is this what is causing my battery drain?
Reply
Old Sep 16, 2020 | 09:03 PM
  #5  
mmartinez's Avatar
mmartinez
Melting Slicks
15 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Liked
 
Joined: Sep 2008
Posts: 3,135
Likes: 802
From: Espanola New Mexico
Default

The click you hear when reconnecting the negative battery cable is normal, the negative battery cable should be the last cable you reconnect. I would pull your battery have it charged and load tested to rule out the battery. Please repost after having your battery checked and if battery drain continues we can proceed to further troubleshooting.
Reply
Old Sep 16, 2020 | 09:24 PM
  #6  
DWAVette's Avatar
DWAVette
Thread Starter
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: May 2020
Posts: 1,663
Likes: 702
From: Baton Rouge, Louisiana, metro area
Default Battery

Originally Posted by mmartinez
The click you hear when reconnecting the negative battery cable is normal, the negative battery cable should be the last cable you reconnect. I would pull your battery have it charged and load tested to rule out the battery. Please repost after having your battery checked and if battery drain continues we can proceed to further troubleshooting.
I have a stacked-pile load tester. I will test the battery tomorrow.
The negative post is the last one I am connecting.
I wonder why the passenger headlight motor tries to spin even though the lights are down. The driver motor does not do this. I have been reading that the HCM shuts off the motor given conditions. I hope this is normal.
Reply

Get notified of new replies

To Strange click/battery drain





All times are GMT -4. The time now is 08:05 PM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE