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74 all original luv just stopped working one day. I thought it was the fuel lump but checked and there is no power to it. Traced back to the relay and found the black with red that goes to the pump from the relay doesn't get power with the key on. But the black with yellow gets a little over 10 volts. It's a replacement relay so I know it's good. Not sure where to go from here. Should I check the voltage regulator? What kind of values at which wires should I be getting?

The fuel pump relay triggers when the alt is charging.

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Certified pilots, looking down on people since 1903.

74 had a mechanical pump, electrics started in 76. You have a 76-- or someone has converted or upgraded your 74 maybe.
In any case, black/red to fuel pump should have power in the "start" position only, until running. Then alternator supplys power as has been said.
Disconnect the regulator plug and see if it starts. If it does you have alternator/regulator problems.

It definately was manufactured in 74, it has less than 33000 ORIGINAL miles, when I bought it it still had the original tires!!! Yes I have struck gold!!! Thanks for the advice I will try to d/c the v/r plug n see what happens. Thanks.

Just checked the title... due to the late manufacture date of November 1974, the truck is titled 1975.

The 1975 wiring diagram shows a electric fuel pump and if this is a real late 74 it may have the 75 specs and sold as a 1975 model year.

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Certified pilots, looking down on people since 1903.

Yes I would guess you have an early 75. I owned a 74 for many years with a mechanical pump, probably an early 74 model. Great little truck.

BTW Good find!

Hey egg if i jump power to the white with blue wire should i have power at the black/red coming out of the relay? if the scenario that u suggested for me works how do i know if its alternator or regulator? i want to stay as stock as i can but been thinking of putting in a higher amp alt... whats your opinion? i rather not cut this pretty specimen up (even just a couple wires). thanks again guys

does anyone know how to make a photo smaller on an iphone? been trying to upload some shots for yall but keep gettn the too big of a file notice

If you go to the info section of the website Ben has gone through the trouble to load all the wiring diagrams for each year truck. Look up the 75 model and all questions can be answered there.

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Certified pilots, looking down on people since 1903.