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The ECU fuse should be in the main fuse panel, Located under the hood close to the battery on top of the inner fender. The fuse layout is printed on the lid. What are your symptoms? The ECU very rarely goes bad and is very expensive
Here are what the different colors do.1991 Ford F150 Truck Car Stereo Wiring Schematic Car Radio Battery Constant 12v+ Wire: Green/Yellow Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Red or Black Car Radio Illumination Wire: Blue/Red Car Stereo Dimmer Wire: Orange/Black Car Stereo Antenna Trigger: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Orange/Green Left Front Speaker Negative Wire (-): Black/White Right Front Speaker Positive Wire (+): White/Green Right Front Speaker Negative Wire (-): Black/White Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Pink/Green Left Rear Speaker Negative Wire (-): Pink/Blue Right Rear Speaker Positive Wire (+): Pink/Blue Right Rear Speaker Negative Wire (-): Green/Orange
first the cam sensor shouldn't be upside down from the 95. they both should be with the plug facing down. they 95 CAS has a different plug than the 99 CAS. the 95 has round pins and the 99 has flat pins.
95-96
-------------------- 97-99
----------------------------- also the 95-96 relays are opposite the 97-99
95-96
------------------------ 97-99
--------------------- besides that it could be the ecu. i also have heard of the locating pin on the intake cam shearing off, allowing the gear to turn with the timing belt without the actual camshaft spinning.
pin 86 and pin 30 at the relay should have power then your right about ground supplied from the ecu and the other goes to the starter solenoid check for battery voltage on those 2 pins 86 and 30 one fuse is under the hood and the other is under the dash.
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