E4OD Keeps Voltage On The Brake Wire
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E4OD Keeps Voltage On The Brake Wire
Hey everyone, I lurk and learn but dont post to much. The other day my 92 F350 w windsor power started lighting up the brake lamps dimly when the key was on. I figured the brake switch stuck and blew it off till I got a brake switch. Didnt fix it, power on the wire. Then I thought the trailer plug had a short, so I unhooked everything, and still had 3.5-4volts on the wire prior. Started pulling fuses and the ecm main power killed the lamps. Hooked it back up and tried looking for something wrong on the wire junctions and the transmission valve body was buzzing underneath. I fired up the truck and went through every gear function, shut it of and the lamps were off, no buzzing. What is going on, any advice? Last week it seemed like the TC didnt lock up for a 20 min drive, then did after a restart. It this a bad TC lockup solenoid? Maybe a bad connection on the trans? The trans is a reman and when I put it in I made sure the the RH connector had ALOT of dielectric grease and visually looks ok. Any ideas is much appreciated!! Thanks!
Postmaster
Joined: Aug 2005
Posts: 4,728
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From: Cleveland, TN
Are you running led light bulbs?? If so you need to add the loading resistors to the system.. Or go back to regular bulbs like the truck was designed for...
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Yes, it does have led bulbs in the rear, it has a flatbed on it. Never had trouble before, they have been in for some years. I sure will try, not sure I understand the connection, but will try anything, thanks!
Cargo Master
Joined: Mar 2010
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From: Laramie, WY
Wire the load resistors in parallel to the brake lights. This topic came up earlier this week. I may butcher this part...The PCM sends a test voltage (very low current) through the brake lights, and expects a certain voltage drop (it's way of knowing if the brakes are applied). If you use LED's the PCM thinks the brakes are on full time (doesn't see the voltage drop, and the test signal dimly lights the LED's), and won't lock the converter.
Maybe your LED's had a built in resistor, and it failed? That'd explain why you didn't notice it before.
Maybe your LED's had a built in resistor, and it failed? That'd explain why you didn't notice it before.
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That was it! Switched out the led tails to 6 in oval round incandecents from my trailer and everything works as it should. I sure learned something today!
Thanks guys!
The LEDs came in the truck when I bought it. I think you are right, it looks like these are very expensive LEDs with a board and a resistor on the board, probably failed, and I never knew. It does appear that at least one row of LEDs on one light had not lit, bad Im sure. You fellas are life savers!
Thanks guys!
The LEDs came in the truck when I bought it. I think you are right, it looks like these are very expensive LEDs with a board and a resistor on the board, probably failed, and I never knew. It does appear that at least one row of LEDs on one light had not lit, bad Im sure. You fellas are life savers!
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