Power DC fuel pump off trailer plug - Diesel Forum - TheDieselStop.com
 
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post #1 of 5 (permalink) Old 10-11-2017, 05:11 PM Thread Starter
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Power DC fuel pump off trailer plug

Need help here. I know it has been discussed that getting 12V to the hot pin on the 7 pin trailer plug takes some tricks. I tried plug in, start truck, press brake... no luck. fuses appear to be good.
What i am trying to accomplish is power my DC fuel transfer pump off the 7 pin. I have it wired with positive to the 12V pin, and NEG to Ground as it should be. all other spaces are empty. When i plug it into an older GMC we have, it works perfect. on 3 of our new fords... no juice. whats the trick?

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post #2 of 5 (permalink) Old 10-12-2017, 02:19 PM Thread Starter
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For now i have it powered through the trailer marker lamps. seems to be working fine as it is a 20 amp pump, and the fuse for the trailer marking lamps is a 30 amp.

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post #3 of 5 (permalink) Old 10-14-2017, 08:10 AM
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Assuming you don't have the Upfitter switches to use?

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post #4 of 5 (permalink) Old 10-14-2017, 08:33 AM
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Quote:
Originally Posted by wingnut60 View Post
Assuming you don't have the Upfitter switches to use?
I do have the upfitters. I could run a line back to the pump. Problem I have with that solution is the tank is not permanent installation. I ususally set it in the rear, get 100 gallons and transfer it to my 500 gallon tank back at the farm. Around here it cost more to have off road diesel delivered than on road diesel costs at the pump.

I think I'm going to add a resistor in the brake and light circuits on the plug to trick the truck into seeing a trailer. I don't run with it hooked up anyway, just while I'm sitting moving fuel.

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post #5 of 5 (permalink) Old 10-16-2017, 09:25 AM Thread Starter
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the pump sits stationary and is used by several trucks in our yard. an AC pump would have been ideal...however someone ordered a DC pump not paying attention, and a $9 trailer plug is cheaper than an inverter. Can't return the pump either. we all have a 7 pin, so i figured that is easier to use rather than wiring every truck up to use an upfitter or switch. at that point i'll go buy an inverter. Wired up to the trailer tail lamps is working, but i want to know how to run the 12V off the trailer plug for my other trailers charging the batteries. Does the system need to sense a trailer WITH brakes to work?

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