Hi I have a 91 F-150, 5.0, e4od, no radio, I need to know what the normal amprage draw is with the key off, doors closed, can any one help?

 

Zero

 

Thanks for posting, but no help at all!

 

Do you mean in the Acc position? Because if you mean in the off position, unless there is an alarm, there should be no draw.

 

Yes I ment what I said in the off position, I;m loosing 1.3 amps with the key off, Most vechicles I have worked on ususlly have a very small draw all the time, Just wanting to know the allowable spec. Thanks

 

With no clock/radio and no alarm system, the only possible current draw is probably the Keep-Alive Memory in the PCM. According to the 96 ford shop manual, that should be a number less than 50 milliamps.

 

Thats what I was looking for! I checked and it seams to be in the speed sensor circuit, ever hear of a problem like this? I have had some odd problems with this 91.

 

Your VSS circuit is so different from mine that I can't begin to tell you where to look

 

That sounds about right. Just enough to keep system capacitors from discharging. 1.3 amp is notable. Start pulling fuses, one at a time to isolate the circuit. If that doesn't help ID a failed switch or actuator/compromized wire insulation, I'd suggest checking bleed by of a partially pooched starter solenoid. Not enough to actually pull in the starter. See what happens if you remove the Ignition switch trigger wire from the starter solenoid.

 

Hi Yaminski, well I spoke with the guy who rebuilds Harley Davidson starters and generators for me, he has a automotive electrical repair shop here in Daytona, I know that more than a ideal draw but he says no biggie as long as the truck doesn't sit for weeks at a time, that was a week ago, been driving it every day and its fine, I know the additional .7 amps is in the speed circuit and frankly I don't care for the time being.I finally took it for a 100 mile trip and now I;m rebuilding the cooling system as well, geez getting expensive, almost 750 bucks in this truck now! lol. I could figure out how to upload the leaking intake pics so if you can let me know I;ll E mail it to ya, thanks bud your been a big help.

 

50 milliamps is 0.05 amps. At 1.3 amps you're drawing 26 times the max allowable.
If it were mine, I'd get after fixing it

 

Did you check this stuff? Make sure nothing passes through the solenoid w/key off. At least pinpoint the circuit by individually pulling fuses, then fusible links if need be.
I couldn't agree more. This will eventually take it's toll! Something drawing 1.3 Amps at rest ain't a good sign! Check the condition of the alternator wire harness too. They've been known to actually cause engine fires on some trucks.

 

Yes I know if the truck sits for any length of time it will need a boost but driven daily I can live with if for now, So Fat 813.00 dollars total in this truck, drove a thousand miles since last Tuesday, and NP problems at all and 20.6 mpg, half of that at max load, towing as well. Thanks guys, I fix the draw by replacing the speed sensor soon, thats .7 amp draw.

Mugsy