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Hey RL—I’m working on adding an accessory that would be mounted near my rear view mirror. I did some digging around the forums and learned about the center console sunroof switch being a good source of switched 12v power, but I prefer going a different direction. Today was spent doing some investigating with upper dashboard removal (very easy) and planning out how a cable would run up the A pillar and to the center of the windshield. To my joy and surprise, there’s a passthrough between the luggage compartment and upper dashboard, suggesting that a tap to the fusebox is a good candidate.
Next steps are to identify which fuse is the best choice for switched power. One area I’m stuck on is finding a suitable ground for the fuse tap. There are a few screws surrounding the immediate fuse box cover but I didn’t have time to get my multimeter out. Wondering if anyone here has worked out a similar setup and where you placed your ground.
A fuse tap plugs into a fuse location allowing the original fuse to still work through it and there is a pigtail wire that has +12v. You run that to your accessory not to ground. Doing the latter would short it.
Are you just in need of a ground connection to also run up the A-pillar in addition to the wire coming from the fuse tap?
if so, on the fender side of the fuse box there are three screws holding a small cover plate which covers all the wiring coming into the fuse box. Remove that and on the fender wall itself you’ll see a large ground lug which grounds all that wiring and has two brown wires connected to it.
Please share more details of what you’re installing and the wiring diagram for it. Inquiring about running a fuse tap to ground has me slightly concerned and would hate to see you cause some unintended damage.
Actually my mistake (bad memory). No need to remove that cover.
The large ground lug with brown wires is immediately next to the hood strut on the fender wall. So right behind the cover (not underneath it), though removing the cover may give you more room anyway.
Last edited by boomboomthump; Mar 30, 2022 at 08:17 AM.
Actually my mistake (bad memory). No need to remove that cover.
The large ground lug with brown wires is immediately next to the hood strut on the fender wall. So right behind the cover (not underneath it), though removing the cover may give you more room anyway.
This is a big help, thanks so much. I’ll check out that ground point.
Hi JSF,
I have run switched power from the plug under the seat for the heated seat function. If you do not have heated seats the fuse in the fuse box becomes dedicated to whatever you are adding. The nice thing about tapping into power there is it is designed for relatively high amperage, unlike the switched power that controls items such as the radio head.
Here is my page on adding stuff that you may find useful: https://993servicerepair.blogspot.co...outlet-to.html
Andy
Hi JSF,
I have run switched power from the plug under the seat for the heated seat function. If you do not have heated seats the fuse in the fuse box becomes dedicated to whatever you are adding. The nice thing about tapping into power there is it is designed for relatively high amperage, unlike the switched power that controls items such as the radio head.
Here is my page on adding stuff that you may find useful: https://993servicerepair.blogspot.co...outlet-to.html
Andy
Thanks, Andy! So that’s who wrote the blog post.
I’m using the heated seats fuse as well even though my car doesn’t have this option. Thankful to Porsche factory for wiring this up at least.
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Fuse Tap and Ground
