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Old 11-16-2006, 11:17 PM
Young_unn Young_unn is offline
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Hey ive wandered back with soem new projects (Monte Carlo)

I have a 1980 Monte carlo with a 305 and a 95 Crown Vic Police Cruiser 4.6 ltr

well as usual with me everythign that could go wrong, yes does go wrong.

The monte carlo has a charging problem. It has eaten one battery already, and is about to eat my secoind new one.

the car has what looks liek and i was told a new alternator. i tightened up a connection in the back of it but it doesent seem to be workign right. I usually dont have a problem with it losing charg when the lights are off. but then the lights go on it will die within 10 minutes. (die as in wont start 15 minutes later)

i hooked a battery tester to it and when lights were off it showed 12.40, and when lights were on it droppped down to 12.00 in abotu 45 seconds. at that point i turn lights off. ( i drove the car with lights on for 5 minutes before that) (it had fully charged battery when i left)

once when i got hoem i tried to start it and it wound not start, but next m,ornign ti started with what seemed to be little trouble.

coudl it be start selenoid, voltage regulater? alternator? how do i test them?

whgat could be wrong?

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Last edited by Young_unn; 11-16-2006 at 11:42 PM.
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Old 11-17-2006, 06:39 AM
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Do a voltage check with the engine on. You should have in the order of 13.5 to 15 volts at the battery terminals. If you still only have battery voltage, say 12.5, the most likely candidate is a bad alternator.
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Old 11-17-2006, 03:47 PM
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Do the test C&C says. One problem with this year of car is the alternator brackets. The brackets, or mounts are a very poor ground for the alternator, and it's very critical to have a good ground. What can be done is add a ground wire to the back of the alternator. You can go to any hardware store and pick up a 5/16 bolt, a short one that should screw right in. I believe my jimmy was a 3/8 bolt. But anyways you'll find a empty bolt hole in the back of the alternator shell which makes a good grounding for a wire added.

Then you can run your ground wire to the engine block somewhere. If you do find out it's a bad ground, Make sure you use a 10 gauge ground wire.

I have a wire I keep handy with a alligator clip on each end. When I feel that my charging problem is a bad ground, I clip one alligator clip on the alternator and the other on too a good ground on the engine. Then I start the engine and see if my voltage has raised. If it does, then I know I have a bad ground. If it doesn't Then I assume it's either the alternator or the voltage regulator.
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Last edited by justen; 11-17-2006 at 03:49 PM.
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Old 11-18-2006, 01:09 AM
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how about wandering down to the parts house and have them check it? it's usually free.
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Old 11-18-2006, 11:00 AM
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Quote:
Originally Posted by danny
how about wandering down to the parts house and have them check it? it's usually free.
Great minds think alike...................

If you find that you have a wiring problem, don't try to repair the wiring. It is 26 years old, instead build an easy small harness for it. It will only take you 10 minutes............
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Old 11-19-2006, 03:10 PM
Young_unn Young_unn is offline
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I think ill wander on monday. didn tknow they did that. and im doiwn there about 3 times a week. well we learn new things everyday

m going to go through and ground the mounts and everything as best as possible and the check it and if need be reground it.

how would i connect it to the engine block?
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Old 11-19-2006, 03:52 PM
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Look for a bolt or a bolt hole on the intake manifold. You could also ground it to the firewall or side like a fender, but sometimes that doesn't always work. But doesn't hurt to try it and see.
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Old 11-20-2006, 05:52 PM
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I took a wirebrush to all the mounts and bolts,. i took if off cleaned everythign and put it on. NNow it reads 1..72 w/o lights and like 13.62 with lights. used to read 12.40 w/o light and just dropped with em.

i think its fixed
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Old 11-20-2006, 07:52 PM
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13.62 would pass, but it's on the border line of being good. 13.62 you maybe able to live with if you don't have a big stereo system.
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Old 11-20-2006, 08:19 PM
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i think the range you are looking for is between 13.8 and 14.2 volts.
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Old 11-20-2006, 08:27 PM
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Actually 10 gauge wire is only rated to carry 30 amps. If you need to ground it, you should assume that the wire will carry the entire rating of the alternator. If the alternator is rated at 80 amp, the wire should be able to carrying 80 amp. I don't have all the wires memorized, but I would guess that would be a #2 or #4 wire (definately consult a chart). A #10 wire likely gets by because there is still some ground through the mount and rarely does the alternator actually put out full load. However a melted wire glowing red, while pumping 80 amps into a bad battery that is pumping out hydrogen gas, could be a leathal combination.

Excuse my paronoid safety attitude, but I work for a chemical company that takes safety to the rediculous extreams. A good problem to have.

Last edited by olddog; 11-20-2006 at 08:33 PM.
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Old 11-21-2006, 07:26 PM
Young_unn Young_unn is offline
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SO i should probably go over and clean everythign out again? will a better ground get me up out of 13.62 and too 14.2 ish?
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Old 11-21-2006, 08:00 PM
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Try this, But becareful doing so. I'm sure you have a pair of jumper cables. (you only need one wire, or side of the cable to try this) Clamp one end onto the outer casing of the alternator, A ear or anyplace you can clamp on too. But do not touch any power wires. Then you can either clamp the other end somewhere on the engine block or the ground of the battery. Make sure your cable will not get into the radiator fan. then start engine and read voltage. But becareful. If the voltage doesn't rise. I assume it's weak alternator.

What your doing is making a direct battery ground connection. I don't not advise people to do this often, but it can be done if your careful. And it will not hurt the battery or alternator.
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Last edited by justen; 11-21-2006 at 08:06 PM.
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Old 11-22-2006, 07:15 PM
Young_unn Young_unn is offline
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Ok Thanks ill try it, and be careful with it
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  #15  
Old 11-23-2006, 11:26 AM
Gearhead52 Gearhead52 is offline
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Another test that is real simple is a test that you can do with a simple volt meter.

Connect the meter and watch the voltage after starting the engine. it should jump to 13.5 or more. Then start turning things on, heater blower, lights, etc. The voltage must stay above 13.5. If it doesn't then replace the alt.

The GM alternator will produce charging voltage with only one diode working but won't produce enough when the accessories are turned on. Could be as simple as the lights being turned on.

I have seen them fail to charge with only the brake lights on but were at the minimum charge before the lights were on.

PS......Nice looking Monte......Very few of that year left that look as good as yours.
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Last edited by Gearhead52; 11-23-2006 at 11:28 AM.
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