'87 Battery drain
Thread Starter
Intermediate
Joined: Jul 2011
Posts: 42
Likes: 2
'87 Battery drain
Unless I switch off my battery, it will drain and not crank in about five
days. Battery is fine, the drain is in the 15A circuit for the lamps, radio computer. Can anyone guess at the most likely source before I go on
a fishing expedition.
Bon Air
days. Battery is fine, the drain is in the 15A circuit for the lamps, radio computer. Can anyone guess at the most likely source before I go on
a fishing expedition.
Bon Air
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
go thru the under hood lites, the cabin accessory lamps, and the timers and door switches. If you are sure its in that circuit, get the FSM out and follow the drawing to find the timers and d/c each until the drain stops.
I once had a similar issue that turned out to be a relay under the hood.
The FSM drawings are so detailed that you can ID every portion of the suspect circuit and go directly to the pieces and test each instead of guessing and the try this, that method.
head lite switches have been known to cause some things like this. That switch has input on the cabin dash background lites and dimmers...
I once had a similar issue that turned out to be a relay under the hood.
The FSM drawings are so detailed that you can ID every portion of the suspect circuit and go directly to the pieces and test each instead of guessing and the try this, that method.
head lite switches have been known to cause some things like this. That switch has input on the cabin dash background lites and dimmers...
Drifting
Joined: Jan 2005
Posts: 1,354
Likes: 325
From: San Antonio Tx
The 15A ctsy/clk fuse has all the courtesy lights including under hood and spare tire, antenna relay, Bose amplifier relay, heater and a/c controls, cigar lighter and constant power to the radio for the clock and preset memory. A FSM would really make it easier. Good luck.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Park the car in the garage with all the lights out at night.
Look for any signs of a light.
The courtesy mirror and glove box are normally hidden and easy to spot in the dark.
Look for any signs of a light.
The courtesy mirror and glove box are normally hidden and easy to spot in the dark.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
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