The fuse should be determined by its load on the circuit, e.g. head
lamps: 2x60W (Halogen head lights) + 2x5W (rearlights) + 4x5W (side
lights USA)= 140W. This means 140W/12V=12A total current drawn through
the switch so a fuse of 15A or 20A should be fitted.
The fuel pump will not draw that much, probably less than 5A so a 5A
fuse will do, but if it blows try 7,5A etc. I have no experience with an
OD relay but I assume this can draw a fairly high current, try 10A first.
For these extra, non original, fuses I would always use the modern
freely available ones only needing a crimp on female spade connector
each side.
Kees Oudesluijs
NL
Op 29-12-2012 4:35, john spaur schreef:
> It has been recommended to add fuses to:
>
> 1. The red wire coming from the back of the headlight switch
> 2. The white wire at the connector behind the intake manifold going
> under the car to the fuel pump
> 3. The white wire to the overdrive relay
>
> From what I have read from other sources the fuse size is determined
> by the wire size. It appears the fuses should be 10 amp or less.
>
> Would 10 amps be correct for these three circuits?
>
> John Spaur
> '62 BT7
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