Battery drain

2001 FORD MONDEO
85,000 MILES • 1.8L • 4 CYL • 2WD • MANUAL
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COL JAMES
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Tested all fuses. The ignition relay fuse reduces the drain. Tested ignition relay seems to be okay. Any ideas?
Nov 20, 2019 at 3:12 AM
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ASEMASTER6371
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Good morning,

Did you measure current or voltage at the battery?

I attached a guide for you to view. It gives you the steps for tracking down a draw.

https://www.2carpros.com/articles/car-battery-dead-overnight

Roy
Nov 20, 2019 at 3:37 AM
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COL JAMES
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Thank you for your reply, new battery fully charged. Checked all fuses and relays have a draw between negative pole and negative cable. The only drop in drain is when I take out the ignition relay fuse. Although the relay clicks and has zero draw across terminals ohms.
Nov 20, 2019 at 5:06 AM
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ASEMASTER6371
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Are you measuring amps or voltage?

The spec is 50 to 75 milliamps is normal.

Roy
Nov 20, 2019 at 6:19 AM
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COL JAMES
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Thank you for your reply. I think I have found the problem. I am getting an ac reading across the battery when running the engine so I think it must be a bad alternator diode.
Nov 20, 2019 at 7:51 AM
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ASEMASTER6371
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Keep me updated.

Roy
Nov 20, 2019 at 9:44 AM