1. I have not heard of extra length fuses. I'd just pull and existing fuse to check its length to be sure (even though it's a pain to reach, it will give you a definitive answer).
2. Are you sure that you have the requisite 2 fuses in the add-a-circuit (assuming that is what you are using) and not just 1, and that you have the right size add-a-circuit? The pulled fuse above should fit in the add-a-circuit to confirm this.
3. Are you sure the circuit you are trying to tap is directly controlled by the ignition switch and not the car's computer (which might add a delay or control the voltage)? And, did you test the fuse slot with a voltmeter in both off/on positions to confirm this operation? If you are using a blank fuse slot this is especially important as they might not all be powered.
I know it can be a pain in these newer vehicles to deal with these items (I had a similar issue) but it's still better that cutting into a line. Also, did you check the owner's manual to see if you might have a secondary fuse buss inside the vehicle that might be easier to access? Also did you try flipping the add-a circuit 180 degrees?
Last edited by poolmon; January 17th, 2017 at 07:57 PM.
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