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Charging system

Sent to Car Experts September 06, 2005 4:50 p.m.

1992 Mercury Grand Marquis runs until the battery is dead. I had the alternator and battery tested and they are good. I visually inspected the wires and they seem to be good. There is no drain on the battery when it is not running.

Customer (name blocked for privacy)

Status: Closed Value: $50

Answer
September 06, 2005 6:48 p.m. (1 hour and 57 minutes later)

REPLIED

BATTERY DRAW PROCEDURE

There is a procedure for finding a battery draw like that. You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.

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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.

Reply to Hammer Time
Sent September 11, 2005 8:10 p.m. (5 days and 1 hour later)

Your answer didn't work. I think i'm gonna junk the car.

Customer (name blocked for privacy)

Answer
September 11, 2005 8:13 p.m. (3 minutes and 11 seconds later)

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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.

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