Battery Drain


Old 08-01-07, 02:53 PM
Thread Starter
Join Date: Feb 2005
Location: Michigan
Posts: 335
Battery Drain

I replaced the battery in my car (93 Grand AM) in march. Now twice, in the past 2 weeks, it has been too drained to start it. I had left my radar detector on, which was never a problem before. The car used to be able to sit a week with the radar detector plugged in and still start fine. It wouldnt start today(wednesday) after being driven last on monday. I'm not sure what is wrong now. It might be the detector going and drawing too much current.

Battery Energizer E75-N
900 CA at 32 Deg F
720 CCA

I charged the battery up and pulled off the positive cable and measured the current with a DMM

.02A Draw without radar detector
.22A Draw with radar detector.

Voltage when running

14.47 at idle
14.40 at about 2000 RPM

From this information I'm guessing that the alternator is fine and the radar detector is going bad and drawing too much current. Is this assumption correct?
Sponsored Links
Old 08-01-07, 03:16 PM
Join Date: Oct 2006
Location: Wilmington
Posts: 4,219
Where is the radar det. plugged in?? If plugged into the usual cig lighter or computer port, that should be dead with the key out(I think). Cig lighter definitely dead, comp./phone port-?????? You have obviously done some detailed trouble shooting. I would look for a voltage source for the det., that is dead with the key out. Also, check all battery connections for corrosion, loose connection, etc. Don't just look, disconnect the connections and inspect. Especially those small side mount connections, they are notorious problem areas.
Old 08-01-07, 04:09 PM
HotxxxxxxxOKC's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Jul 2006
Location: USA
Posts: 8,044
I highly doubt a radar detector would cause a battery drain. The detector would be fried if it was drawing to much power.

Do what Just_Bill said, very good advice.

I would not rule out a bad alternator.

.22a draw is minimal. Remember, your stereo and other systems are pulling minimal amperage as well.
Old 08-01-07, 04:22 PM
Banned. Rule And/Or Policy Violation
Join Date: May 2007
Location: Wisconsin
Posts: 8,629
Since you don't NEED a radar detector, you have the advantage to leave it out of the mix and compare with and without, and see, and take it from there.
Old 08-01-07, 05:40 PM
Forum Topic Moderator
Join Date: Oct 2002
Location: Hamilton County, Ohio
Posts: 4,287
Not all batteries are created equal. Take it somewhere and have them put a load test on it. Even a new battery occasionally has problems.

Thread Tools
Search this Thread
Display Modes
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -7. The time now is 02:35 PM.