Floating Versus Chassis Tied Light Relays In Off Position

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=147686
Printed Date: May 02, 2025 at 12:51 AM

Topic: Floating Versus Chassis Tied Light Relays In Off Position

Posted By: kellogs
Subject: Floating Versus Chassis Tied Light Relays In Off Position
Date Posted: June 03, 2023 at 5:35 AM

For any vehicle, am I guaranteed to have a chassis connection on the + side of a light bulb when it is *not* lit ?

I am particularly interested in the rear turn/brake light bulb.

Thanks

Replies:

Posted By: i am an idiot
Date Posted: June 03, 2023 at 7:41 PM

LED lamps not necessarily. Incandescent lamps, it will be very close to ground (Through the element(s) of the bulbs attached to the wire.

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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

Posted By: kellogs
Date Posted: June 24, 2023 at 6:58 PM

Just to clarify, I was referring to the GND connection marked "??". Is that "terminal" always grounded or can it also be left floating?

Thanks

posted_image

Posted By: Ween
Date Posted: June 25, 2023 at 6:17 PM

It can be left floating. Chrysler at one time wired their parking light relays with the 87a terminal grounded.

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