Hello. my 89 Ford Mustang 5.0 started acting weird this past week. It was running fine and everything until one day as I was driving and I came to a red light all the car power just died and it didn't start. I bought a new battery and the car started, the next day it did the same thing at about a block away from when it happened the day before. So I bought a new alternartor bacuase the battery voltage went down everytime I would turn on the A/C. The car has new battery, new starter, new alternator, new post cables, and it is still dying when the A/C is turned on or off. Any ideas??
Help My Mustang is acting crazy!!
- Thread starter mixael-17
- Start date
If the voltage drops sharply bebore the engine dies, this may be your problem. The secondary power ground is between the back of the
intake manifold and the driver's side firewall. It is often missing or
loose. It supplies ground for the alternator, A/C compressor
clutch and other electrical accessories such as the gauges.
Any car that has a 3G or high output current alternator needs
a 4 gauge ground wire running from the block to the chassis
ground where the battery pigtail ground connects.
The 3G has a 130 amp capacity, so you wire the power side
with 4 gauge wire. It stands to reason that the ground side
handles just a much current, so it needs to be 4 gauge too.
Picture courtesy timewarped1972
intake manifold and the driver's side firewall. It is often missing or
loose. It supplies ground for the alternator, A/C compressor
clutch and other electrical accessories such as the gauges.
Any car that has a 3G or high output current alternator needs
a 4 gauge ground wire running from the block to the chassis
ground where the battery pigtail ground connects.
The 3G has a 130 amp capacity, so you wire the power side
with 4 gauge wire. It stands to reason that the ground side
handles just a much current, so it needs to be 4 gauge too.
Picture courtesy timewarped1972
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Where does the other end of the ground wire shown goes???jrichker said:If the voltage drops sharply bebore the engine dies, this may be your problem. The secondary power ground is between the back of the
intake manifold and the driver's side firewall. It is often missing or
loose. It supplies ground for the alternator, A/C compressor
clutch and other electrical accessories such as the gauges.
Any car that has a 3G or high output current alternator needs
a 4 gauge ground wire running from the block to the chassis
ground where the battery pigtail ground connects.
The 3G has a 130 amp capacity, so you wire the power side
with 4 gauge wire. It stands to reason that the ground side
handles just a much current, so it needs to be 4 gauge too.
Picture courtesy timewarped1972
Attachments
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