Batt light on,need help

The battery may hold enough charge to stay on. You should probably take your alt off and have it tested, or take your car to a parts store and have them load test it in the vehicle.

you may have also fried the fusible link going to the alt power wire from the starter selenoid.......start with testing the alternator first, and look at your starter selenoid and the wires going to it. if your charging system is the original 2g alternator, there's a green wire on one of the posts that goes to the alt and it has a fusible link on it.....

Fuseable links are a wire that act like a fuse. When they get overloaded, they
open circuit and do not pass current. The alternator fuseable link is in the wiring
harness connected to the starter solenoid. If you are not skilled in automotive
electrical work you may find this difficult.

See the following website for some help from Tmoss (diagram designer) & Stang&2
Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/

http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif


Diagram courtesy of Tmoss & Stang&2birds



You will need an ohmmeter or DVM (Digital Volt Meter) or Multimeter to measure the resistance of the fuse links. You will need to disconnect the positive battery cable to make the measurements. You should see less than 1 ohm across a fuse link.

Rynb15 said:

so how would i go about fixing it if it got overloaded?

Click to expand...

When a fuseable link overloads, it blows just like a fuse. You have to split open the wiring harness at the starter solenoid, locate the bad link, cut it out and solder a new link in.

If you are not skilled in auto electrical service, I recommend that you enlist the help of a friend who is skilled.

why the hell is your negative lead painted red?????

do yourself a favor and swap that **** out

go buy an el cheapo digital multi meter at any auto parts store. the two things you'll use the most are volts, and ohms, with one of these meters you can tell if your alt is charging the batt or not......your really need one of these meters if your going to do any work on a car......

timewarped1972 said:

go buy an el cheapo digital multi meter at any auto parts store. the two things you'll use the most are volts, and ohms, with one of these meters you can tell if your alt is charging the batt or not......your really need one of these meters if your going to do any work on a car......

Click to expand...

Good point. If you want to go fast in an old car you will need either megabucks or lean to do it yourself and use the megabucks for go fast goodies.

Step 1.) Find the instruction book that came with your Multimeter. Read it and familiarize yourself with how it works and how use it. If you lost the book or didn’t get one with it, do a Google search on the web to find the manufacturer’s web site & download a copy of the manual.

Step 2. ) Make sure that you know what test lead plugs into which jacks on the Multimeter. There are usually several different jacks on most Multimeters, and they have different functions. Make sure that your battery(s) in the Multimeter are good: if you have any doubts, replace the battery(s).

Step 3.) Once you are sure that the Multimeter is functional and you have the leads plugged into the jacks for Ohms ( the upside down “U” symbol), do some simple measurements to make sure that you know how to use it correctly. Set the switch to the lowest range and touch the leads together: you should not see “nothing” but you should see 1.0-0.3 ohms. Measure a 60 watt light bulb: cold it will measure about 17.5 Ohms. It you measure it while it is hot, the reading will be greater.

Step 4.) Make several test measurements using the ohms function and the DC volts function. Remember all resistance measurements must be done with the power off the circuit. This avoids false readings and possible damage to the ohmmeter.. Repeat steps 3 & 4 until you are sure that you can do it without making any mistakes.

Step 5.) Then see http://www.autozone.com/servlet/UiB..._us/0900823d/80/1d/db/3c/0900823d801ddb3c.jsp and carefully study ALL the information under the Heading Chassis Electrical, Basic Electricity – Understanding & Troubleshooting

Step 6.) Go back and carefully re-read both of my previous posts and download and print the diagrams from the link posted. http://www.autozone.com/images/cds/gif/large/0900823d80195963.gif for wiring diagrams.

Step 7.) Apply what you have learned and make the test measurements using the information in the wiring diagrams & my previous posts.