Question about 1985 Chevrolet Corvette

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Voltage drain 85 vette when I have heater and lights on I can watch volts gauge go under 12 volts, if I turn lights off volts climb back up 13 or 14 or visa versa

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Have your alternator checked sounds like it is not putting out enough under load

Posted on Jan 29, 2009

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1 Answer

What cause battry to die over night?


If test light is a 12 volt light tester AND ILLUMINATES BRIGHT it shows that a component is actively trying to complete a circuit and yes drawing power causing a drain on your battery, now if test light illuminates low, possibility could just be ecm memory or antitheft system active . either way this test should only be done with a 12 volt test light as if you use a 5 volt (computer friendly) tester , false light will have you chasing a ghost. trust me. that trick helps by checking for parasitic draws a 12 volt tester does not illuminate when keep alive memory voltages are present . those voltages are not enough to drain over night. good luck

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My battery gauge goes out and my check gauges light comes on and battery doesnt charge in my 2002 dodge ram 1500 slt with 5.9 motor


with the engine running use a volt meter to check battery voltage with the head lights on, should be around 14 volts on a 12 volt system, if 12 volts or less the regulator or alternator is at fault . if around 14 volts there is a drain or short, the battery could also be faulty.

Oct 03, 2016 | Dodge Ram 1500 Cars & Trucks

1 Answer

Battery keeps dying on my legacy 3000 i dont think its battery


Get a cigarette lighter voltage gauge and watch the voltage.

It should never go below 12 volts before you crank the engine, or after you turn it off. If it's above 13 volts after you shut it off and below in the morning, the battery is on it's way out.

Right after you start it, especially in the morning, the voltage should rise to 13.8 or 14.8 volts and then drop back down to 13.2 or 3 as you drive. If it doesn't you have a charging problem.

Definately remove and replace the cables to the battery, the problem is often the connection.

Jul 30, 2013 | Subaru Legacy Cars & Trucks

1 Answer

Battery dead after truck runs for 45 mins


Your voltage goes down after you start the truck? Your voltage should climb up to 13.5-14 volts (at the battery terminals) with the truck running. If it does not climb to that area you have some kind of alternator problem.

Feb 02, 2013 | 2000 Ford F250 Super Duty Crew Cabs

2 Answers

Check gauge light comes on and voltmeter shows low voltage


Not if your alternator is faulty.
Check the battery voltage first, that will prove alternator.

Dec 02, 2017 | Cars & Trucks

1 Answer

85 Jeep CJ 7 engine bucks with headlights on.


ALTERNATOR COULD BE WEAK OR WRONG SIZE IN AMPS.NOT PUTTING OUT ENOUGH POWER.CHECK TO MAKE SURE POSITIVE BATTERY CABLE AND GROUND CABLES IN GOOD CONDITIONS.IF BATTERY CABLES IS BAD.THEY WILL CAUSE VOLTAGE PROBLEMS.

Jan 01, 2010 | Jeep CJ Cars & Trucks

1 Answer

97 Malibu cranks but wont start Theft light is not on. If you keep trying (15 to 20 min)eventually it will run as long as the RPMs stay above 1000. Fuel pump won't come on unless I jump across the relay,...


What is the correct year ? Above your post it says 2005 Chevrolet Malibu but your post shows 1997 ????? An what size engine ? 3.1 or 3.4 or 2.4 L I would also say your crankshaft position sensor could be bad , but that's just a guess ! Without testing that's all anyone on here can do , guess . Videos on youtube showing how to test crank sensor !

Plus you state that you ohm check ground connections , sorry but that's not the way to check . You do voltage drop testing ? Suggest you watch this . The Trainer 47 What measuring voltage on the ground side means

The Trainer 29 Understanding How Electrical CIrcuits Work and How to Test... How to test for short to ground ohmmeter vs test light

GM Fuel Pump Relay Testing



Mar 04, 2017 | 2005 Chevrolet Malibu

2 Answers

I have a 85' CJ7 With 258 engine. I roll the


if you disconnect the coil wire and the voltage increases, the i would have to say you have a shorted out coil.

Oct 01, 2009 | 1984 Jeep CJ7

1 Answer

Relay/resistor heater blower


There are two fuses for the fan. One is probably a 20 Amp in the fuse panel in the cab and marked "Heater". or "Heater/AC" The second is under the hood may be marked Heater, Blower, or Fan and should be 30 Amp. The one in the cab supplies switched 12 volts to the fan speed switch. The one under the hood supplies the 12 volts to the relay. The relay is normally energized by the 12 volts through the 20 Amp fuse in the cab and through the switch. I think you find that the fan has the normal speeds except for missing HI with the underhood fuse removed, and will turn off with the ignition that way. There is no hazard in operating it that way but you may want to replace the resistor/relay assembly before it gets too cold. The relay is a pretty trouble free device in most cases, maybe you can find a deal on a good one at a junkyard.

The whole idea with the relay under the hood started back in the Sixties believe it or not. There is considerable voltage drop in the wiring between the fan switch and the blower fan motor. By adding the relay under the hood right next to the motor, the voltage drop was reduced, both by the shorter wire, and by using heavier wire to boot. The motor gets really close to the full system voltage when the relay is closed. In your case where the relay keeps the fan running, it can drain a battery rather quickly too!

Dec 18, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

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