Having problems with your 1998 Honda Prelude ?
Dear Honda Tech,
i am having a problem with the charging system in my car. i have replaced the alternator with a factory direct Honda alternator that was certified good at the honda dealership before being installed in the car. i have since takin it out again to have it retested at napa to make sure it haden't been damaged in shiping or instalation and it had not the test came back that the alternator was putting out the same as it was certified by honda to produce. so i then replaced my batte
Start the car. Pull off the negative battery cable, dont let it touch \015\012anything, just hold it in your hand. If the car dies go get an \015\012altenator. also check wire from alternator to battery for a problem.
Wow, some writeup-the voltage should be checked at the back of the alternator and the battery at the same time-if the pos post on the alternator reads 12.4 resting, that's what it should read at the battery too-and if it reads 14.4 volts running, at the battery, the alternator should read that too-if it does not (alternator reads 11.8, battery reads 12.40 it is the alternator. If the alternator reads 14.4 and the battery reads 12.4, the issue is wiring or the ecm is not allowing current to flow to the battery-there is an internal regulator in the alternator, but the ECM, if defective, can cause your issue. Check for relays or fuses that might be bad first, but it sounds like your ECM may be the problem and now you probably have another alternator issue which will have to be corrected first-then check the resting and running voltage at both places, and go from there. Testing an alternator off the car only proves it is good (or bad) off the car-therefore you need to determine what changes when mounted, and it can only be wiring (harness) , or control (ECM)
Repair Help & Product Troubleshooting for 1998 Honda Prelude
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