1985 Honda Prelude replaced alternator and regulator trouble shooting wires, battery light still comes on

you will need a new alternator. battery light means there is no charge in the electrical system. always first check the earths and wires before changing the alternator as a faulty earth can also be the main problem.

change the battery cables terminals you can get them at walmart for under 5 bucks last time I checked

Hi, the wire to the computer is inconsequential to the operation of the charging system. Have you replaced the regulator?

From what you have described either the replacement alternator or regulator are faulty.all 1985 model here have the reg built into the alternator.Put a voltmeter across the battery terminals while running.volts should be 14 to 14.8 if it is being charged correctly,12.8-13.9 if it is poorly charging and less if it is only running on the battery.I assume that the fanbelt is tight and not slipping.There are several other reasons that can cause this fault but establish the basics first.Make sure that the main feed wire from the alternator to the battery is fitted onto clean terminal and isnt broken internally.To test this you can carefully check volts at the alternator terminal end,be careful not to arc out on anything metal while doing this.you may blow the charging fuse(check this anyway as part of test).the volts should be the same as reading from the battery.If it is lower,twist the wire about while reading and see if it changes.It will either need replacing if faulty or try new terminal ends first.Make sure that the replacement alt has the same plug configuration as the one you removed.Honda have a few different plugs that switch the trigger wire around(whether round or rectangular)Hope this helps you.if not get back with your test results and we can work together on this

The alternator is not charging, even if it's new, you probably have a fuse that is blown. Look in the fuse panel under the hood where the big fusible link style fuses are held. I think you'll find that one of the larger fuses in this panel is bad. They are hard to see sometimes, a multimeter may be needed to check them.

pull each individual fuse untill the test light goes out.also unplug the fuse to any clock or tradio memory first

If the battery light comes on start there. Its a charging issue so would think your alternator, batery cable from alternator or voltage regulator (may be internal/external)

Do u have the carbureted or fuel injected model? (both were available that year) The carb. model has a separate voltage regulator which is mounted on the right front shock tower. The fuel injected model is inside the alternator, under the end cover.
Have the alt. tested before u purchase a new one to make sure that's the problem. Most parts stores will check it for free. Be sure to disconnect the neg. battery cable before u start to remove it. Let me know how u make out. Curt

check for electric short.
if you have factory or after market alarm, that may be the cause.

how do I remove a alternator from a 19988 honda accord?