I have a 95 honda civic ex coupe. I just finished an engine swap (direct replacement d16z6) and a wire tuck. Everything was ready. When I went to turn the key, nothing happened. Upon further inspection I discovered that my acg fuse (15amp) was blown. Upon replacing it I turned the key and heard it blow. I am an OK mechanic - did the swap - but electrical stuff makes my head spin. Thank you for your time.

. Check alternator--a field winding could have shorted out or the voltage regulator is bad. Disconnect the negative battery terminal, before installing a replacement.

. Perform main relay harness tests:

https://www.askmehelpdesk.com/cars-t...tml#post358044

. Check ignition switch and harness.

The ACG fuse controls voltage to main relay Terminal 5.

Hey tx, I had a hard time following your directions only because I can't find an electrical wiring diagram to look at. Is that a necessary tool to have? If yes, do you know where I could find one free of charge? Which one is the main relay? You mentioned terminal 5. Would that be located near the u/d fuse box? Where can I find the voltage regulator to check? Thank you so much, I've read your other posts and I think the knowledge that you have is amazing!

The main relay in your Civic is located left of the fuse box, wedged against the left kick panel and above the hood latch. Remove fuse box cover and lower dash panel for access. You really don't need a wiring diagram to run these tests.

If the alternator is taken to AutoZone, O'Reilly Auto Parts, or other auto parts store, they should be able to test it for free. The voltage regulator's location depends upon the brand. If it's a Nippondenso, the voltage regulator is located inside the end cover. If it's a Mitsubishi, the voltage regulator is located inside the rear housing. Should you decide to rebuild the alternator, be sure to replace brushes, replace front and rear bearings, clean slip rings, check that there isn't continuity between slip rings and the rotor or rotor shaft, perform stator test, and check rectifier diodes, among other things.