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Wiring is done but there is a draw on the battery
i have my wiring complete and the car runs but something is draining the battery quite fast. With a volt meter on it you can watch the volts drop (car is not on when this happens). i have the engine ground hooked up and the ground at the rear of the car. The only thing was that I had the alternator wired wrong and it wasn’t charging but that is fixed and tested. The only other thing I can think of is. Pin 17 for the check engine light is supposed to be tan. Mine is yellow with black. I can not find a tan wire. The mustang manual mentions a yellow with black wire for pin 17 but also says pin 17 is tan. I hooked up the yellow with black from pin 17. I have no check engine light. Any help would be appreciated. Thanks |
Also the battery is old. Could that be the problem? |
Try this:
https://www.wikihow.com/Find-a-Parasitic-Battery-Drain Since you said that you had an issue with the alternator, you may want to disconnect that first. |
The alternator has been fixed and is charging at 14 volts. I know the battery is bad. I just didn’t think it would drain while you watched it on the meter. |
Turns out the battery was bad after all. Pin 17 for the check engine light is supposed to be tan. Mine is yellow with black. I can not find a tan wire. The mustang manual mentions a yellow with black wire for pin 17 but also says pin 17 is tan. I hooked up the yellow with black from pin 17. I have no check engine light. Any help would be appreciated. Thanks |
If you are using a computer from a 1988 Mustang, that year model does not display a check engine light. That feature was not introduced until 1989, when they also introduced the mass airflow sensor on all Mustangs. Only California emission equipped Mustangs had a MAF sensor in 1988.
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Thanks. I did not know that about the check engine light. I did about the mass air. So if I don’t have a check engine light how will I get codes? |
Originally Posted by baad88
(Post 25231)
So if I don’t have a check engine light how will I get codes? |
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