amp requirements - Team Camaro Tech
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post #1 of 3 (permalink) Old Mar 16th, 04, 05:28 PM Thread Starter
Join Date: Mar 2004
Posts: 22

I am converting my water pump to a dual impeller setup, each bank with its own motor, and will also have an electric radiator fan- The water pump has no indication on it of how many amps it will draw. I read the techline writeup on the CS alternators, and wondered what amperage rating I should be ballpark figuring on for the total package, if I am conservative and safely go a bit over. Thanks. Bruce
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post #2 of 3 (permalink) Old Mar 17th, 04, 04:52 AM
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Join Date: Dec 2002
Location: Saint Louis, Missouri
Posts: 1,101

If the manufacturer cannot give you a specification as to what size fuse or circuit breaker to use then you could do somthing like this (kinda crude but it works).
Wire up the electric water pumps ground and before connecting up the power take a glass fuse of lets say 15A and put it inline on the power wire and see if it blows. If it does, try a 20A and see what happens. If this blows try a 25A or until it's large enough to where it doesn't blow the fuse.
Don't jump from a 15A to a 30A right away but go in increments of 5A or so.
If it draws over 30A and you don't want to get the higher dollar 40A, 50A, 60A or higher fuses you can parallel wire 2-20A fuses to give a total of 40A of fusing, 2-25A fuses for a total of 50A, etc. Doubling the fuses and in parallel is what they do in a lot of car stereo amplifiers to keep the physical fuse size small. Some amps are fused at 90A and have 3-30A fuses in parallel.
Like I said it's a crude way of doing things but it works.

1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)

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post #3 of 3 (permalink) Old Mar 17th, 04, 06:10 AM
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Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277

Get a clamp-on DC amp meter. Put your pump in a bucket of water (do not submerge the motor) and dead-head the pump by covering the outlets.

68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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