1990 Honda Accord

Electrical problem
1990 Honda Accord 4 cyl Front Wheel Drive Automatic 136852 miles

The charging system warning light of the car comes on whenever we are drying and the car is running. The battery of the car is a new one and the voltage of the car is still 12-52AH. We do not understand why this is happening and if I want to fix this problem on my own how would I do it? What do I need to buy to replace whatever is wrong with the car? I cleaned the negative and positive on the battery of the car but the warning light still comes on. The car is running fine too. Thank you for your help.
January 2, 2009.

Hi ducvanphung,

1. Perform preliminary inspection. Turn ignition on. If charge warning light comes on, go to step 3). If light remains off, remove alternator harness connector. See Fig. 1 . Using jumper wire, momentarily connect White/Blue wire terminal to ground.
2. If warning light now comes on, perform ALTERNATOR OUTPUT TEST . If warning light still remains off, check for burned bulb, open circuit in White/Blue wire, or open circuit in Black/Yellow wire between warning light and dash fuse box or between dash fuse box and ignition switch.
3. Start engine and allow to idle. If charge warning light goes out, turn off engine and go to step 4). If light remains on, perform ALTERNATOR OUTPUT TEST .
4. Turn ignition on. Disconnect alternator harness connector. Remove driver's side kick panel and integrated control unit. Charge warning light should go out.
5. If light goes out, integrated control unit is shorted. If light remains on, repair short circuit to ground in White/Blue wire between warning light and dash fuse box or between dash fuse box and alternator.

1. With engine at normal operating temperature, remove alternator harness connector. See Fig. 1 . Turn ignition switch to ON position.
2. Ensure battery voltage is present between Black/Yellow wire terminal of harness connector and ground. If battery voltage is present, go to step 4).
3. If battery voltage is NOT present, check dash fuse No. 2 (15A). Check for open circuit in Black/Yellow wire between dash fuse box and alternator.
4. Turn ignition off. Reconnect alternator harness connector. Connect alternator tester with integral carbon pile (to apply electrical load to system). Start engine. Ensure all accessories are off.
5. Operate engine at 2000 RPM and apply a load with carbon pile so voltage reading drops to no less than 12 volts (cooling fan must not come on while testing). Check maximum amperage and compare with appropriate alternator specification chart. See Fig. 2 .

NOTE: Due to engine operation, subtract 5-10 amperes from the maximum reading.

6. If amperage reading is within specification, charging system is okay. If amperage is NOT within specification, perform full field test.
7. Recheck amperage. If amperage is still NOT within specification, replace alternator. If amperage is within specification, internal voltage regulator is defective and must be replaced.

Jan 6, 2009.
I read your reply and I have a few questions. What is an integrated control unit? What does it mean when
integrated is shorted? Where is the dash fuse box? What is an integral carbon pile? Where is the internal voltage regulator? Whenever I start the engine the battery warning light comes on. It also happens when I use the breaks. I'd appreciate it if you can answer these questions.

Jan 8, 2009.
If you don't really know anything about electronics, I suggest you to bring it to a shop, or you will be in trouble further with your car. You may short something out if you don't really know anything in electronics.
It is critical to be working in electronics if you are not an experienced technician!

Jan 9, 2009.
I was looking at your accord wiring for alternator I no the ignition and the one for the battery but what is the letter " C " FOR
this is for my stock car no more ecu cut off all wire only need to figure out the alternator please help

Jun 14, 2010.
White and yellow wire for what

Jun 14, 2010.
Hi speedproshop,

The " C" terminal is the alternator outpout signal to the PCM and since you do not have the PCM, this wire can be unattached.

Jun 17, 2010.