Question about 1993 Ford Mustang

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Im getting voltage on my ground to the battery,is this normal

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  • dwcoody74 Jan 31, 2010

    well i am,evrything is off

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How many volts are you reading and how are you getting this reading??

Posted on Jan 31, 2010

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It's not possible to get voltage or sparks on the ground wire connection without the positive cable making contact to the battery. Isolate the positive cable away from battery and do the test connection again. You will see it doesn't spark. There had to also be some source that was left on, light switch, door open, key on etc.Turn everything off and shut all the doors before you retest the cable wire.

Posted on Jan 31, 2010

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Having trouble with all my speakers except my twitters in a 2007 Saturn Outlook...what do I start with? Fuses are good


Speakers get power from the amp if your system has one or from the radio , if the tweeters work it's not a fuse problem . You like listen to your stereo loud . Blew a channel in the radio or amp ?
Take it and have it checked for DTC'S - diagnostic trouble codes
DTC B1025 01: Audio Output 1 Left Front Circuit Short to Battery
DTC B1025 02: Audio Output 1 Left Front Circuit Short to Ground
DTC B1035 01: Audio Output 2 Right Front Circuit Short to Battery
DTC B1035 02: Audio Output 2 Right Front Circuit Short to Ground
DTC B1045 01: Audio Output 3 Left Rear Circuit Short to Battery
DTC B1045 02: Audio Output 3 Left Rear Circuit Short to Ground
DTC B1055 01: Audio Output 4 Right Rear Circuit Short to Battery
DTC B1055 02: Audio Output 4 Right Rear Circuit Short to Ground

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier (if equipped) have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3 V AC and slightly higher.
Do you know how to do DC voltage testing ?
Without Amplifier without UK6
Ignition OFF, disconnect the harness connector at the appropriate speaker.
Radio ON, test for 5.0-7.5 V between the signal circuit terminal A and ground.
? If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
? If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
Test for 5.0-7.5 V between the signal circuit terminal B and ground.
? If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
? If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
If all circuits test normal, replace the speaker.

Dec 25, 2016 | Saturn Outlook Cars & Trucks

1 Answer

I changed the fuel pump relay still dnt wanna start now im bout to change the whole fusebox harness


Did you check for voltage at the relay socket before replacing the relay ? Most relays have four or five pins , two should have battery voltage , one goes to the fuel pump an the last one is a ground supply from the PCM - powertrain control module - engine computer if you know what that is . If you look on the bottom of the relay it should have some numbers 85,86 , 30,87 ! 30 an 87 are the fuel pump side . 30 is battery voltage for the pump ! 85 is battery voltage an 86 is ground from PCM . VEHICLE RELAYS Operation Diagnosis Before replacing wiring harness test ! Check out these videos... Fuel Pump Electrical Circuits Description and Operation

Jul 22, 2015 | Cars & Trucks

1 Answer

Were is headlight low beam relay


It is located in the under hood fuse/relay box . It's non -replaceable ,if bad whole fuse box has to be replaced ! The low beam headlamps may be turned ON in 3 different ways:
?€¢
When the headlamp switch in the HEAD position for normal operations


?€¢
When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)


?€¢
When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay

Battery voltage is applied at all times to the coil and switch sides of the LOW BEAM PCB Relay located in the underhood fuse block. When the headlamp switch is placed in the HEAD position, ground from G202 is applied through headlamps ON switch signal circuit to the body control module (BCM), signaling the headlamps ON request. In response to this signal, the BCM applies ground through the headlamp low beam relay control circuit energizing the low beam relay. With the relay energized, battery voltage is applied through the switch side of the relay, the left and right low beam fuses, and the low beam supply voltage circuits illuminating the low beam headlamps. Ground for the left headlamp is provided at G101 and the right headlamp at G100.
Low Beam Relay Test

  1. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
  2. Connect a test lamp between the control circuit terminal A5 and B+.
  3. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  4. ?‡'
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  5. If all circuits test normal, replace the underhood fuse block.
  6. Ignition OFF, disconnect the harness connector at the inoperative low beam headlamp. Test for less than 5.0 ohms between the ground circuit terminal B and ground.
    ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

    Connect a test lamp between the supply voltage circuit terminal A and ground. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    ?‡'
    If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.


    ?‡'
    If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.

    If all circuits test normal, test or replace the low beam headlamp.

Jun 10, 2015 | 2006 Chevrolet Chevrolet Impala LS

1 Answer

Headlights will not come on 02 s10


Have you checked fuses ? The Instrument panel fuse block , Fuse Block - I/P
LH of the I/P, near the door jamb switch - LF , fuse # 7 HDLPSW 10amp.
In the underhood fuse / relay box - Headlamp power relay , RT HDLP fuse 15amp LTHDLP fuse 15amp.
Battery positive voltage to the headlamp switch is supplied by the HDLP SW fuse in the IP fuse block. When the headlamp switch is in the HDLP position, the headlamp power relay coil is energized. A voltage signal is also sent to the body control module (BCM) signaling that the headlamp switch is activated. The headlamp power relay coil is grounded at G102. When the headlamp power relay is energized, the relay supplies battery voltage to the LT HDLP and RT HDLP fuses. Both low beam headlamps are grounded by the multifunction headlamp dimmer switch in the low beam position through the normally closed headlamp grounding relay in the body relay block to G200.
High Beams-Except ZR2 Battery positive voltage to the headlamp switch is supplied by the HDLP SW fuse in the IP fuse block. When the headlamp switch is in the HDLP position, the headlamp power relay coil is energized. A voltage signal is also sent to the body control module (BCM) signaling that the headlamp switch is activated. When the headlamp switch is in the AUTO or PARK position and the ambient light sensor detects darkness, the BCM produces a voltage signal that will also energize the headlamp power relay. The headlamp power relay coil is grounded at G102. When the headlamp power relay is energized, the relay supplies battery voltage to the LT HDLP and RT HDLP fuses. The RH high beam headlamp receives current directly from the RT HDLP fuse. When the headlamp switch is in the HDLP position, the BCM removes the ground path to the headlamp grounding and DRL relay coils. This allows current to flow to the LH high beam headlamp through the normally closed contacts of the DRL relay. Both high beam headlamps are grounded by the multifunction headlamp dimmer switch in the high beam position through the normally closed contacts in the headlamp grounding relay to G200. A ground signal is also sent to the BCM in order to confirm high beam operation.

In the i

Mar 01, 2015 | Cars & Trucks

1 Answer

My farmall H will not turn over at all. Battery is good. 6volt. Manual push button start. New starter . Nothing Help please.


Haven't work on one these but following is what I use for finding bad grounds even though I got several meters.

You can rig up test light using some wire and a 6 v lamp bulb. It won't give an exact voltage readings but a brightly lit lamp indicates at the present of the voltage.

For testing for bad grounds use the main battery ground connection and probe the ground connections around the starter while trying to start. The test light will make it safer as you are just looking for a lit lamp will trying to start; just place the lamp where you can see it from the starting position. The test light will light if there is a bad connection between the starter's ground and the battery ground.

The same setup can be uses to probe to see if voltage is even reaching the starter through the switch and solenoid connections. If the starter solenoid is separate from the starter it can have a bad ground too and will not operate.

Nov 30, 2014 | Cars & Trucks

1 Answer

I have a 99chevy 4x4 im getting 6.9 volts bleeding back through the ground when i turn key on its causing the cluster to go crazy [[[ INOP ]]]


do you read 6.9 volts on any ground surface before turning on the ignition key. First i would unhook the plug in, from the alternator,then check for voltage on ground. Then unhook the battery wire from the backside of the alternator to see if this stops the voltage bleeding to ground..Turn on the ign does guages work ok? If so, have the alternator checked for a rectifier or stater lead shorting out to ground.

Sep 11, 2010 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Voltage guage showing low reading. Had alternator tested. They said it was bad. Replaced it. Only getting 13. something with engine running. 12. something with out running. A "guy" told me the new...


You can isolate the new alternator by starting the car and disconnecting the negative battery cable with engine running. Now measure the voltage at the positive terminal to a ground. This will be your alternator voltage under normal load (w/o battery). It should be 14-15 VDC and closer to 15 if it's new. If not, return the new alternator and try again. If the voltage is normal, try touching the negative cable back to the battery terminal and see if it takes it back to 13. If yes, maybe your battery has an internal short.

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2 Answers

The battery runs down when 1993 lumina sets overnight


You have a parasatic load. use an ammeter and connect it in series with battery ground post and battery ground cable . Make sure vehicle is off and all accessories are off .AS A RULE OF THUMB (if you don't have specs) ANY READING OVER A HALF OF A VOLT IS NOT ACCEPTABLE. Start pulling fuses until voltage returns to normal(0.50 volts) or whatever spec's say. The fuse you pulled that made voltage return to normal is the affected circuit. Find its short and repair it. Had several lunina's were the head light switch was the villan. Good luck.

Aug 20, 2010 | 1993 Chevrolet Lumina

1 Answer

Accelaration???


check the alternator, voltage can not drop below 13 volts,also test battery and all ground connections

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3 Answers

Replaced alternator and battery still showing low/varying voltage


check the battery ground cable and make sure that you have a good engine ground.to do this you need to use a voltmeter and check for voltage drop between the battery terminal and engine it should not be more 0.4 volts .if that is o.k. the alternator internal voltage regulator is not good and replce the alternator again.also make sure the drive belt is tight.

Jan 21, 2009 | 1994 Oldsmobile Cutlass Supreme

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