denvergs4

Maybe the team at CL can help out. So I added a escort radar to the 350, direct wire. I went down and purchased a bussman fuse add on. Plugged it into the 15a fuse for hazards under the drivers side dash and got nothing. Confused I put the old fuse back in and tried my flashers and now it’s dead! WTF

Did I damage the relay? Is there something here I’m not seeing?

Thanks guys!

eddie420

They are polarity sensitive. You might have it installed wrong. Flip it 180 degrees and try.

IndyIS

Pretty unlikely that you did any damage. Try what eddie noted and hopefully all works fine.

I thought hazards worked even if the car is off? If that's the case, wouldn't that mean the radar detector is always on if you don't manually power it down? I ran the add-a-circuit and used the auto wipers fuse. I had it in backwards the first time, then flipped the fuse and was off and running.

bclexus

Fuses have no polarity.

eddie420

I thought he used Add-A-Fuse which do have polarity. If he plugged it back in without one... then yeah, something is wrong lol.

IndyIS

Me as well. If you insert the fuse one way, nothing works. Flip it and all is good.

bclexus

Maybe there is a fuse block with LED or it has a diode that does require correct polarity to work or to prevent backfeed of positive voltage. Fuses by themselves have no polarity - they only present a weak (link) current point in a circuit that is designed to open-up (purposely melts/blows to open the circuit) if an overcurrent condition takes place, which protects the wiring and electrical/electronic devices downstream.

denvergs4

bclexus

First, are your turn signals operational? The #16 (HAZ) fuse protects both the hazard circuit and the turn signal circuit. If the turn signals still work then the problem is associated with just the hazard circuit downstream of this fuse, which likely means the flashing relay has failed. So, do the turn signals work? That is the first step to learn about...

In your troubleshooting process, have you checked the #16 (HAZ) fuse clip (both sides) for voltage? Check both sides of the fuse clip to see if you are receiving ~12 DC voltage. Even though the hazards work without the ignition On you should make sure the vehicle accessories is turned On when testing so the turn signals are [normally] operational - though the turn signals should not work 'if' there is no voltage at this fuse clip.

I assume you know how to use the multi-meter to test for DC voltage, where the positive probe goes to one side of the fuse clip being tested and the negative side of the probe goes to chassis ground. You may have to jerry-rig something on the positive probe to reach (and make contact with) the metal fuse clip down in the fuse block. You'll need to test each side of the fuse clip, because you cannot be sure which side of the fuse clip is the voltage source (battery) side of the clip and which side of the fuse clip is the load (hazard & turn signal lights) side.