Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

power no power

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Old Oct 20, 2010 | 11:47 PM
  #1  
Bobby Suth's Avatar
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From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
power no power

89 iroc 350tpi.I bought this car 3 months ago and get a little time to look at it now and then.The tanny needs a rebuild so it aint going far.But I go out and start it to keep the mice out and the fluids moving.Mice had there fun with the previous owner.I'm still finding cut wires from them.Somtimes I go out to start it and the dome light wont even come on.I will hook the bat. charger up and it starts charging then acts like I unhooked it.and start over.then all of a sudden it runs up to 75% charge,lights work great and all.Battery conection seams OK.would a short in the system recover that fast,or do I need to try harder on the bat. cables or some other conection?
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Old Oct 21, 2010 | 10:32 AM
  #2  
NINÅ's Avatar
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Mice Not Nice

Sounds like those meece dined on delicious insulation causing a short or two.

Sometimes the under-hood or hatch light does not go out so check those easy ones first.

Then connect an ammeter in series with the battery.

If there is more than 50 milliamps there is excessive draw.

(You can use a small bulb such as a side marker bulb if you don’t have an ammeter.)

Disconnect the alternator wires to see if IT’S the problem.

With everything turned off and doors closed observe the current flow.

Pull the fuses one at a time, including the pump fuse near the battery, till you see the current drop.

That’s the circuit with the problem.


Happy Racing!



Make Noise, Turn Left, Repeat

.

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Old Oct 21, 2010 | 10:48 PM
  #3  
Bobby Suth's Avatar
Thread Starter
Senior Member
15 Year Member
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Joined: Mar 2010
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From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
Re: Mice Not Nice

NINA,I'm a carpenter with a camaro,my last one was a 70 rs.Alot has changed,When you say connect the ammeter in series with the battery,Do you mean disconect the poa. battery cable and put one pole to the bat.and one to the cable.Or is there somthing else your saying in these words that my limited abillity can comprehend.can I take the fuse out and test in the fuse box.Can the altnator have a short inside it that would cause a slow drain on the bat.Guess I need to take the bat out charge it up and get it tested.I just don't like them auto parts stores,they don't know any more than i do.
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Old Oct 23, 2010 | 12:12 AM
  #4  
Bobby Suth's Avatar
Thread Starter
Senior Member
15 Year Member
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Joined: Mar 2010
Posts: 989
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From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
Re: Mice Not Nice

OK, I got this sperry DM-210A out of the drawer.Black test line is in the center hole called com.the red test line is in the right side hole says max 600v,dc/ac cat II.I turner the selector to 200 V with squigly line over the V.With the pos. battery cable unhooked I put the red to the battery post and black to the battery cable.It had a reading of 11.5. I left the battery cable unhooked. there are 10 neighbor cats all around here and I have sean no sign of mice. the dammage was done before I got it.How come the battery has only gone down 2 times in 8 weeks and now it will go down right away.well what do my readings mean?I'm dumber than the mouse!
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Old Oct 24, 2010 | 09:04 AM
  #5  
Bobby Suth's Avatar
Thread Starter
Senior Member
15 Year Member
iTrader: (2)
 
Joined: Mar 2010
Posts: 989
Likes: 9
From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
Re: Mice Not Nice

Ok,I did some test,I took the alt.cable off last night and left the battery cables hooked up with a fresh charged bat.Before the dome light wouldn,t come on by morning.Good news for bobby.This morning the dome light worked.
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