What the fuse block does
The fuse block on an Elite wiring harness holds the fuses that protect the ECU and the supply circuits around it, and it arrives with the correct fuses already fitted. You'll find each fuse's rating and the circuit it protects in two places: on the fuse block wiring diagram, and printed inside the fuse block lid.
Need this diagram? Ask us and we'll send it over with advice for your build. The Elite 2500 version is also covered in our Elite 2500 fuse block wiring diagram article.
Leave the fuse ratings alone
Haltech chose those ratings to protect the ECU and its supply wiring. A bigger fuse doesn't fix anything. It just lets more current through before the fuse gives up, and that current can damage the wiring or the ECU instead.
The only reason to change a rating is if the normal, expected load on that circuit is genuinely higher than the factory spec. If a fuse keeps blowing, treat it as a symptom: find the short, the chafed wire or the failing component first.
Where to mount it
- Somewhere you can reach. If a fuse blows at the track, you want to swap it in a minute, not pull the dash apart.
- Somewhere dry. Keep it well away from spots that can see water, like low in the engine bay, under a cowl drain or near the wheel wells.
- Somewhere solid. Use both screw holes in the block, and make sure vibration can't back the screws out. Thread locker or nylon-insert nuts are a cheap insurance policy.
Confirm every fuse is seated and matches the lid label, and that the block's main power feed is connected exactly as the wiring diagram shows. Our power and ground wiring guide covers the rest of the supply side.
For the wire colors that run to and from the block, see the wire color legend.
