Hella 550 wiring

So i did some searching before actually starting the thread and there is plently of info on wiring. Let me also say that this isnt my first set of hellas installed so i have an idea of what to look for.

I have the Power wires tied together and going to relay #87, next i have jumper wire from relay# 85 to behind relay mount to ground it. Then i ran a wire from relay #86 to inside the cabin to a 3 prong illuminated switch. Last I have power coming from positive terminal on batter with in-line fuse to relay # 30. I also have the ground wires tied together from the lights and ground to a good piece of the frame. (paint removed at both ground spots)

Inside the cabin, (where i think the problem is), i have the relay wiring coming in going to the middle prong on the switch. I have add-a-circuit using 10amp fuse put into the top left open fuse section running to the hot side of the switch and a ground running to the bottom.

The lights at first did not fire up. I started the truck and they fired, meaning to me that I did not have enough volts coming off the fuse panel to fire the lights initially with just the key turned to accessories. Now the lights worked well for a few days until they didnt fire at all. At this point i first checked all the ground connections because historically thats the issue. Let me also say that the illuminated switch I had never light up. I checked the ground and power and still never illuminated. I even swapped the top and bottom prong connections. I went out and got a heavier duty switch thinking the switch was bad but now I can no longer get the lights to fire. I checked all the fuses, the one coming from battery and second one from fuse panel both are intact.

What am i doing wrong??? I have looked at this the last 2 days without any solution.

Where are you guys grounding wires inside the cabin for aux switches. I want to belive its my ground but testing the ground wire to a few different places doesnt chance the result. I am going to my parents to get my tester today so i can try and isolate where the issue is. Any insight greatly appreciated.
 
Register to hide this ad
Update:

Ran a new wire from negative terminal to the switch to make sure ground was good at the switch. Lights still didnt fire.

I think the power to my switch could be the issue. Like stated above im using an add a circuit to the top open fuse spot. Might need to just run a hot wire from battery to switch see if that helps. All other connections are solid.
 
You're shooting from the hip instead of troubleshooting. There are four wires at the relay. One of them is not doing what it should. First job is figure out which one. You want to test each one in sequence.

First, explain one thing. You say you have the two power wires tied together, and then you mention one fuse to the panel and one direct to the battery. Which is it? One feed or two? From where, EXACTLY? Also, where is this relay installed and what screw is it mounted/grounded to?

I take it you want the Hellas to work with key on, but independent of any other lights?

By the way, I have had a Hella harness miswired from the factory, so make sure each wire is going to the relay pin you think it is. Took a while to noodle that one out.
 
Last edited:
Figured it out, ground wire inside the light was just loose enough that it was preventing the light from being properly ground....like many have stated its usually always teh ground.

Thanks for the input and reposnse.
 

Members online

Forum statistics

Threads
278,309
Messages
3,554,071
Members
248,016
Latest member
Advally Service

Trending content

Back
Top