Electrical problem after crate motor install

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marilynliddell

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marilyn
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4
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c30
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1978 f-150
All is good after the crate motor installation in my '85, EXCEPT for two wiring snafus.
1) my fuel gauge (dual tanks) is pegged at 3:00. Somewhere under the hood there's an incorrect or missed connection. It's not even supposed to go further than about 1:00.
2) my heater fan and AC controls don't work.

There were a couple of things that had no need to be disconnected by the first mechanic and those were reconnected to match wiring colors. I have no clues what color coding would be for the two items above. But they must pass through the engine compartment. Anyone familiar with those? I've got a Haynes book but the disavow wiring diagrams because there's "so many". The problems shouldn't be behind the dash or anywhere underneath.

I used two mechanics-the first one pulled the engine before Thanksgiving but his family's home burned down in one of the big California fires and he never came back. I finally hired a well experienced mechanic to install the crate motor (I'm disabled) who did a really good job the truck has never run this well. EXCEPT it would be nice to have the heater , fan, and AC working, and the gas gauge of course.

Any help?
 

yevgenievich

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What part pf ac system is not working? Air flow direction is via a vacuum line and the ac clutch and fans are on a seperate harness from the engine. The power might be coming through the junction block on the firewall amd would be the only place I can think of being disconnected.
 
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Charlie

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:welcome:
 

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