Alternator to fuel pump
Thread Starter
Pro
Joined: Sep 2008
Posts: 660
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From: Tustin California
Alternator to fuel pump
Instead of buying a $70 harness to get the power for the fuel pump directly from the alternator, why not just spend Less than $15 and run a hot wire from the alternator to a 40 amp relay that is triggered by the original ignition source at the pump? Am I missing something. I am no electrician, but it seems on the surface to be pretty simple to do. ??? Rod
Le Mans Master
Joined: Feb 2004
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From: York PA
Instead of buying a $70 harness to get the power for the fuel pump directly from the alternator, why not just spend Less than $15 and run a hot wire from the alternator to a 40 amp relay that is triggered by the original ignition source at the pump? Am I missing something. I am no electrician, but it seems on the surface to be pretty simple to do. ??? Rod
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
DO NOT FORGET to also up-grade the GROUND WIRE from pump to chassis ground!
No use having a massive power cable only to have a dinky ground cable.
BC
Thread Starter
Pro
Joined: Sep 2008
Posts: 660
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From: Tustin California
Next Question: Do I leave the original ignition to pump wire connected and run the alternator wire through the relay to the same pump hot wire post? The thinking is that if the relay dies, there will be the original power still present so I don't get stranded. Thank you, Rod
Le Mans Master
Joined: Feb 2004
Posts: 8,629
Likes: 16
From: York PA
Next Question: Do I leave the original ignition to pump wire connected and run the alternator wire through the relay to the same pump hot wire post? The thinking is that if the relay dies, there will be the original power still present so I don't get stranded. Thank you, Rod
I actually did that also, but never thought anyone else would be nutty as me (hence not mentioning it)
