Question about Honda Prelude

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1985 Honda prelude carbed. The battery light is on an I changed the altenator an regular an battery an it's still on but when I rev the engine over three grand it goes out but I can only drive the car untill the battery dies I take the ground cable of the battery the car dies

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  • travis0770 Mar 27, 2011

    I bought all the parts brand new from Lordco is there supposed to be a power wire to the altenator from battery the plug to the altenator have two small wires an a big ground

  • travis0770 Mar 27, 2011

    Should there be a power wire from the altenator besides the two smalls wires that go onto the clip



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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 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

Posted on Mar 27, 2011

  • Peter da techmen Mar 31, 2011

    Yes the big wire with a round terminal should be a main feed so that the alternator can charge the battery,The plug if it only has a couple of small wire it in are for signaling charge via the battery light on your dash. This large wire should have sparked if you were trying to earth it.Some of these do have an earth wire but you can usually trace the other end to earth. the power feed stud on the alternator has a black insulator around it to avoid shorting on casing.
    If you have the 3 wire plug,yes the heavier wire should be the feed to the battery,This can be probed with a test light to confirm.It should be live all the time.The diodes in the alternator stop the power draining to earth.Report your findings,we will get this beat soon!

  • Peter da techmen Mar 31, 2011

    Make sure that your battery terminals are clean,tight and on the right posts.And the battery earth is secure to body and engine.



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