||On other Pages
links are time dependent fuses. Very high current from a short
will burn a fusible link quickly. Moderately high current will
only melt the link when it gets hot enough. The length of time
depends on the current and size of the link.
Fusible Link Purpose
Fusible Link In Action
Complete Charging System Wiring Diagrams
|Understanding the Charging System Ammeter
'67 Barracuda Main Page
'85 Grand Wagoneer Main Page
Charging & Light System Wiring Diagrams
Headlights & Fog lights
Tips on Wiring (CJ Forum)
If the battery shorts, all of the battery power will be trying to get to ground.
Fusible link (or links on some models) will protect the rest of the wiring from damage if there is a short before any fuses or circuit breakers.
Unlike fuses and circuit breakers, fusible can handle normal high current loads, such as running ignition and headlights and other equipment for short periods of time.
When subject to high current for over time periods, the link should overheat and fail before the attached wires and connectors do.
If there is a dead short, the battery current is high enough to melt the fusible link quickly.
Bare Conductor touches chassis. Battery current goes to ground at contact.
Evidence of overheating likely at connectors.
Shown here the short is in the output circuit of the alternator.
Ammeter will show maximum discharge!
Fusible link should have protected against major damage. Expect evidence of overheating at all connections. Any places that were loose or oxididized will be worse.
|Example of Power flow with new circuits added at starter solenoid.||Circuit Amperage
||In this example, 15 amp could be from:
Lights on relays, 9 amps
Electric Fans, 6 amp minimum
20 amps assumes 5 amps for charging.
25 amps from alternator includes:
2.5 amps for field circuit
2.5 amps for ignition coil
Some modern amperage loads at AA1car.com
Electric Winches are special consideration.
They can draw 200 to 400 amps in use.
An alternator can not supply that much current. It
will have to come from the battery. Then the alternator
will have to recharge the battery.