Page 282 - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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266 Automobile mechanical and electrical systems

Table 3.2 Blade type fuse ratings

Continuous current (A) Colour
3 Violet
4 Pink

5 Clear/beige
7.5 Brown
10 Red
15 Blue

20 Yellow
25 Neutral/white
30 Green

Figure 3.18 Fusible links

blades froze to the screen, a large value fuse might not protect the motor from
overheating.
Fusible links in the main output feeds from the battery protect against major
short-circuits in the event of an accident or error in wiring connections. These
links are simply heavy-duty fuses and are rated in values such as 50, 100 or
150 A ( Fig. 3.18 ).
Many types of terminal are available. These have developed from early bullet-
type connectors into the high-quality waterproof systems now in use ( Fig. 3.19 ).
A popular choice for many years was the spade terminal. This is still a standard
choice for connection to relays, for example, but is now losing ground to the
smaller blade terminals. Circular multipin connectors are used in many cases; the
pins vary in size from 1 to 5 mm. With any type of multipin connector an offset
slot or similar is used to prevent incorrect connection.
Protection against corrosion of the connector is provided in a number of ways.
Earlier methods included applying suitable grease to the pins to repel water. It
is now more usual to use rubber seals to protect the terminals, although a small