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fuse blowing when reversing polarity

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=103819
Printed Date: May 16, 2025 at 6:57 PM


Topic: fuse blowing when reversing polarity

Posted By: rkrosiere
Subject: fuse blowing when reversing polarity
Date Posted: April 08, 2008 at 9:19 AM

posted_image

I want my headlights to automatically raise when headlights are turned on and lower when turned off.

When i test this circuit with a test light it works fine but when hooked up to the headlight actuator it blows the fuse.

I don't see what is wrong.

Is there a simpler way of doing this with fewer relays?

Thanks for your help




Replies:

Posted By: i am an idiot
Date Posted: April 08, 2008 at 6:47 PM
posted_image



Posted By: rkrosiere
Date Posted: April 08, 2008 at 7:58 PM

Thank you for this info. It took me awhile to see how it works but i think i got it.

What function do the diodes have in this circuit? 




Posted By: i am an idiot
Date Posted: April 08, 2008 at 8:07 PM
They keep the low beams from turning the high beams on.  And vice-versa.



Posted By: rkrosiere
Date Posted: April 09, 2008 at 6:47 PM

Thanks so much for your help.

It's rare when someone gives "free" advice.

I really apreciate it.

Rick




Posted By: i am an idiot
Date Posted: April 09, 2008 at 7:49 PM
You know what is just as rare?   Someone actually appreciative for the free help.     Glad to help.


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