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Old 09-06-2005, 08:38 AM
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Power Source for Distribution Block

What is the best source to run power to a central distribution block, where the distribution block will provide power to the fan and headlight relays?

My car is non-computerized, with HEI distributor and no power accessories. Does have A/C and two electric fans. The fans are on relays currently powered by a feed from the alternator. The headlights are not on relays. Battery is located in trunk and connects to starter via heavy cable (0 guage I think).

I was thinking of running a 8 or 10 gauge wire from the altenator to a distribution block, and then feeding power to fan and headlight relays from this block. The distribution block I have bought provides six fused outputs. I would use 30 amp fuse for fan and 30 amp fuse for headlights.

Turning on the fans, which draw about 25 amps total, pulls the voltage down from 14 to about 13 according to the dash gauge. Turning the lights on pulls the voltage down about another .5 volts. A/C doesn't currently work, so don't know what happens when it is engaged.



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Old 09-08-2005, 08:35 AM
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The best way to do that is run your #8 wire from the battery cable lug on the starter. This way you have direct access to the battery during those few times when the alternator can't quite keep up and still good feed from the alternator.

Those two fans are quite a big load so if you have the stock anemic 55 amp alternator, I would install an 80amp after market unit for some reserve capacity. They are really pretty cheap. If you are inclined, you could even get a high amp kit for your existing stock alternator. Those are really cheap (less than $30 as I recall) and easy to install.
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Old 09-08-2005, 06:02 PM
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Doc here,

What willys said...except use a proper fuse link at the starter hook up,

AND do a little more research, I think you'll find fuse links are more suitable for your needs than a fuse will be...a fuse will spike and pop..a link will hold through a spike (start / stop spikes..)

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