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Car dead. Battery not dead. Owner stumped.

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Old 05-14-2019, 03:32 PM
Herman Minister's Avatar
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Location: Laramie, Wyoming
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Question Car dead. Battery not dead. Owner stumped.

Hello everyone. I'm new to this forum, so I apologize in advance if I upset anyone with my first post!

I have a problem I've never encountered before in 40 years of motoring. My 2007 Crossfire Roadster is completely dead, but the (2-month old) battery is totally fine. Thinking this was a flat battery issue I tried charging it, but both of my chargers say it is in tip-top condition and fully charged. I then tried jump starting the Xfire, but still totally dead. FULL DISCLOSURE: I stupidly left the trunk lid open overnight, but never thought the small courtesy light on the trunk lid could cause this. And anyway, wouldn't that just deplete the battery?

Could it be the main fuse has failed? Or does the Xfire have some strange 'you-left-the-trunk-open-you-idiot' fail safe?

Any help with this would be most appreciated. Thanks!
 
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Old 05-14-2019, 03:47 PM
Join Date: Nov 2017
Location: El Paso, TX
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Default Re: Car dead. Battery not dead. Owner stumped.

A few more details would be helpful:
1. How many days since the car last ran?
2. Automatic or manual transmission?
3. Coupe or roadster?
4. Any recent maintenance issues?
5. Can you (have you) read any diagnostic codes?
6. Has your RCM been resoldered/repaired?
 
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Old 05-14-2019, 03:49 PM
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Default Re: Car dead. Battery not dead. Owner stumped.

Originally Posted by Herman Minister View Post
Hello everyone. I'm new to this forum, so I apologize in advance if I upset anyone with my first post!

I have a problem I've never encountered before in 40 years of motoring. My 2007 Crossfire Roadster is completely dead, but the (2-month old) battery is totally fine. Thinking this was a flat battery issue I tried charging it, but both of my chargers say it is in tip-top condition and fully charged. I then tried jump starting the Xfire, but still totally dead. FULL DISCLOSURE: I stupidly left the trunk lid open overnight, but never thought the small courtesy light on the trunk lid could cause this. And anyway, wouldn't that just deplete the battery?

Could it be the main fuse has failed? Or does the Xfire have some strange 'you-left-the-trunk-open-you-idiot' fail safe?

Any help with this would be most appreciated. Thanks!
Welcome.
The battery terminals are clean and tight I hope?
Ground wires are lean and tight?
Are the battery cables are in good condition? As some have found their cables completely corroded under the insulation. Signs of this are possible terminal corrosion and a cable limp in one spot.
Is a new cargo you and how many miles on it?
 
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Old 05-14-2019, 04:34 PM
Join Date: Feb 2017
Location: Santa Rosa
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Default Re: Car dead. Battery not dead. Owner stumped.

When you say completely dead , what does that mean. Do any off the lights work , headlights ?
 
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Old 05-14-2019, 08:16 PM
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Default Re: Car dead. Battery not dead. Owner stumped.

Originally Posted by maggy55 View Post
When you say completely dead , what does that mean. Do any off the lights work , headlights ?
That was going to be my question.

IF the car is COMPLETELY Dead, no lights, no nothing - then check the 200amp fuse with a voltmeter. Do you have 12 volts on both sides? The small box next to the battery the size of a pack of cigarettes has three fuses. One 50A power the engine fan. One 50A powers the brake controller. The 200A powers the rest of the ENTIRE car.

I've never seen anyone blow that fuse.
 

Last edited by pizzaguy; 05-14-2019 at 08:19 PM.
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Old 05-14-2019, 08:47 PM
Herman Minister's Avatar
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Default Re: Car dead. Battery not dead. Owner stumped.

Thanks for replying, ambidextrous. The car last ran about three days ago, with no problems; this is an automatic transmission; it's a roadster; no recent issues, except that I replaced the battery (it was old and not holding charge well); I have no means of reading diagnostic codes; I don't know what an 'RCM' is, but nothing on the car has ever been resoldered or repaired. I hope this info helps.
 
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Old 05-14-2019, 08:51 PM
Herman Minister's Avatar
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Default Re: Car dead. Battery not dead. Owner stumped.

Thanks for your quick reply, onehundred80. The battery terminals are clean and tight; the grounding connection also is good; As far as I can tell, the cables are in good condition - though with the battery fully charged, wouldn't I see some sparking if one of the cables were broken?

My car is a 2007 roadster, with about 43,000 miles on the clock.

Thanks again.
 

Last edited by Herman Minister; 05-14-2019 at 09:21 PM.
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Old 05-14-2019, 08:54 PM
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Default Re: Car dead. Battery not dead. Owner stumped.

Thanks for your reply, maggy55. The car is COMPLETELY dead - as if there were no battery connected. No lights at all, no dash or courtesy lights, no ominous clicking from the solenoid when I turn the key.
 
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Old 05-14-2019, 08:58 PM
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Default Re: Car dead. Battery not dead. Owner stumped.

Thank you for your reply, pizzaguy. I, too, have never known a main fuse to blow on ANY car I've owned. If that is indeed the problem, I assume it means that something on the car drew more than 200 amps! If the main fuse has blown, I'm reluctant to replace that fuse without first finding what caused the fault. Is it common for those fuses to just fail in time? The car is 12 years old, after all.
 
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Old 05-15-2019, 09:33 AM
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Default Re: Car dead. Battery not dead. Owner stumped.

first disconnect your batt for about 1/2 hour,, reconnect and try to start. your car does not sound like a rcm while waiting the 1/2 hour read this :

https://www.crossfireforum.org/forum...-no-start.html

does the remote work to unlock/lock the doors?
 
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Old 05-15-2019, 12:13 PM
Herman Minister's Avatar
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Question Re: Car dead. Battery not dead. Owner stumped.

Originally Posted by pizzaguy View Post
That was going to be my question.

IF the car is COMPLETELY Dead, no lights, no nothing - then check the 200amp fuse with a voltmeter. Do you have 12 volts on both sides? The small box next to the battery the size of a pack of cigarettes has three fuses. One 50A power the engine fan. One 50A powers the brake controller. The 200A powers the rest of the ENTIRE car.

I've never seen anyone blow that fuse.
Okay, so my next question is where would I find the main fuse? I have a 2007 roadster automatic. I found the small fuse box in the side of the dash, and there’s another alongside the battery which contains 3 or 4 small fuses and one larger 40 amp fuse (so not the main). I can find no box in the trunk. Is the main fuse even located in a fuse box, or is it on a bulkhead somewhere? Again, any help would be gratefully received.
 
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Old 05-15-2019, 12:41 PM
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Default Re: Car dead. Battery not dead. Owner stumped.

Main Fuse box Location

 
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Old 05-15-2019, 10:00 PM
Herman Minister's Avatar
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Unhappy Re: Car dead. Battery not dead. Owner stumped.

Originally Posted by amx1397 View Post
first disconnect your batt for about 1/2 hour,, reconnect and try to start. your car does not sound like a rcm while waiting the 1/2 hour read this :

https://www.crossfireforum.org/forum...-no-start.html

does the remote work to unlock/lock the doors?
Thanks fr the advice, amx1397. I disconnected the battery for about an hour - no change, still dead. No, the remote does not work. It's as if the battery has been removed from the car. No courtesy lights, no dash lights, no remote door locks, nothing.
 
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Old 05-15-2019, 10:01 PM
Herman Minister's Avatar
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Default Re: Car dead. Battery not dead. Owner stumped.

Originally Posted by Deetzman View Post
Main Fuse box Location
Thanks for the information. I found the main fuse.
 
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Old 05-18-2019, 01:52 PM
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Default Re: Car dead. Battery not dead. Owner stumped.

Originally Posted by Herman Minister View Post
Okay, so my next question is where would I find the main fuse? I have a 2007 roadster automatic. I found the small fuse box in the side of the dash, and there’s another alongside the battery which contains 3 or 4 small fuses and one larger 40 amp fuse (so not the main). I can find no box in the trunk. Is the main fuse even located in a fuse box, or is it on a bulkhead somewhere? Again, any help would be gratefully received.
What you found was the fuses on the Relay Control Module (RCM), the main fuse is just in front of it where the previous posts arrow points to.
 
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