Re: [AMC-list] Reversed Battery Connections! What did I do???

[tom jennings <tomj@xxxxxxx>]

Ouch (reversed battery). Generally, very bad to do. This to worry about:
ECM
stereo, etc
alternator

Matt made some good suggestions; make sure everything else is OK, or fix it,
or ignore it if you can (eg. stereo).

guages, lighting, etc probably doesn't care at all! However, some relays
have noise-suppression diodes across them. With backwards battery, they
conduct and fry. That probably won't leave you stranded though.

stereo, obvious check

alternator, guessing, but diodes would conduct and carry a crapload of
current. Would depend on how long it was left connected backwards. This is a
crap shoot.

Then I'd check EVERYTHING ELSE, headlights, flashers, etc. You don't need
flashers or whatever, but problems/no problems would indicate things to look
for.


OK, the ECM: modern silicon integrated circuits have zero tolerance for
reverse polarity. If i had to guess without testing, I'd say 80% chance the
ECM is ruined.

I know it's an Eagle, a feedback carburetor I assume? I don't know anything
about those at all, but it's integrated silicon...

What I would do is, disconnect the battery, and leave it off for a whole
minute or five.

Connect the battery.

Turn car on and look for CHECK lamp and fuel pump relay on..off, or whatever
it does normally. If not, it's likely deceased.


If it's a GM TBI (Mark said?) on ignition on it flashes the CHECK light,
runs the fuel pump for 2? seconds, then leaves CHECK on until started. Going
from memory here. If it does nto do that it's fried.



On Wed, Sep 16, 2009 at 18:02, Wrambler <wrambler242@xxxxxxxxxxx> wrote:

> I don't know quite enough about the GM tbi to guess so I forwarded this
> directly to Tom.
> I know he has been busy and not real active on the list.
> He is getting pretty deep into the GM TBI stuff though!
>
> I wish timing had been better this last year....
> After I bought my WJ I had a chance at a 92 Dodge 3/4 ton with 12K original
> miles for $1500!
> Needed rockers and floors, in my condition and so many undones I passed on
> it.
> Man that truck for truck duties and your 88 Eagle for car dutys....
>
> Prolly get sensored, but Dammit anyways!
>
> Hope that car starts up with a minor fix and really hope it finds the good
> home it deserves!
>
> Mark Price
> Morgantown, WV 26508
> 1969 AMC Rambler, 4.0L, EFI, T-5
> 2004 Grand Cherokee Laredo, 4.7L, Quadratrac II
> "I realize that death is inevitable.
> I just don't want to be around when it happens!"
>
> ----- "Nicholas McIntosh" <n.m@xxxxxxxxxxx> wrote:
>
> > From: "Nicholas McIntosh" <n.m@xxxxxxxxxxx>
> > To: amc-list@xxxxxxxxxxxx
> > Sent: Wednesday, September 16, 2009 3:13:04 PM GMT -05:00 US/Canada
> Eastern
> > Subject: [AMC-list] Reversed Battery Connections! What did I do???
> >
> > Hey there,
> > So in getting my eagle ready to be sold, I found it with a dead
> > battery,
> > so I put in one from another car.  But I accidentally reversed the pos
> >
> > and neg connections.  It started crackling and smoking at the
> > solenoid!
> > I got it disconnected right away, but now the fuel pump won't turn on.
> >
> > What do you think I did, and how can I fix it?
> > Thanks
> > Nick
> > _______________________________________________
> > AMC-list mailing list
> > AMC-list@xxxxxxxxxxxx
> > http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com
> _______________________________________________
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>



-- 
All of your arguments are invalid.
Enjoy your unstable system.
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