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Battery drain

Tiny
COL JAMES
  • MEMBER
  • 2001 FORD MONDEO
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 85,000 MILES
Tested all fuses. The ignition relay fuse reduces the drain. Tested ignition relay seems to be okay. Any ideas?
Wednesday, November 20th, 2019 AT 3:12 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Wednesday, November 20th, 2019 AT 3:37 AM
Tiny
COL JAMES
  • MEMBER
  • 3 POSTS
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.
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Wednesday, November 20th, 2019 AT 5:06 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Are you measuring amps or voltage?

The spec is 50 to 75 milliamps is normal.

Roy
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Wednesday, November 20th, 2019 AT 6:19 AM
Tiny
COL JAMES
  • MEMBER
  • 3 POSTS
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.
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Wednesday, November 20th, 2019 AT 7:51 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Keep me updated.

Roy
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Wednesday, November 20th, 2019 AT 9:44 AM

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