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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

86 EFI 302 electrical problems again

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Old Apr 18, 2010 | 05:06 PM
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86 EFI 302 electrical problems again

Ok so I got offered to trade my 86 f150 for another truck and thought my truck was working good, but it died again as if it is not charging. I have replaced the altenator, battery, starter solinoid, starter, coil, head light wiring and fixed all the wiring going to the altenator, battery and starter solinoid. If I charge the battery it seems to hold its charge for a little while then slowly trickles down. I thought I had it working so when I started it it went up in voltage but didn't jump to 14 volts, it just slowly (15 minutes) trickled up to 14 volts. I'm at my wits end, if I can't figure this out I'm going to part the truck and take it in for scrap I've had enough. Thanks in advance for any help.
 
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Old Apr 18, 2010 | 09:21 PM
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Is your dash guage lighting up when you turn the key but don't start the engine? The alternator light is the one I am talking about. In my 89 it looks like a little battery.
 
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Old Apr 18, 2010 | 10:01 PM
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When I first turn the key it goes on, then turns off right away, so basically no.
 
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Old Apr 18, 2010 | 10:28 PM
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Did the 86 have an external voltage regulator or is it internal to the alternator?
 
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Old Apr 18, 2010 | 10:42 PM
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internal and I had the altenator tested and they said it was fine, it sure don't act fine.
 
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Old Apr 19, 2010 | 12:02 AM
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when i first got my truck one of my guages would NOT shut off and that was draining the batt - think it was the dummy lights but don't remember - have you checked those types of connections?
 
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Old Apr 19, 2010 | 12:51 AM
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Yup, I've checked to make sure none of the lights stay on and checked the radio as well. I could be wrong, but it seems more like a charging problem then a battery drain problem. I also checked the grounds as well and changed the battery ground with no change.
 
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Old Apr 19, 2010 | 01:30 AM
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Originally Posted by fepowerguy8
Yup, I've checked to make sure none of the lights stay on and checked the radio as well. I could be wrong, but it seems more like a charging problem then a battery drain problem. I also checked the grounds as well and changed the battery ground with no change.
what condition are your electrical cables in?
 
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Old Apr 19, 2010 | 01:41 AM
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my battery cables? I put brand new ones on and noticed no change. So I put the other ones back on as they didn't appear to be bad anyway.
 
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Old Apr 19, 2010 | 01:45 AM
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Originally Posted by fepowerguy8
my battery cables? I put brand new ones on and noticed no change. So I put the other ones back on as they didn't appear to be bad anyway.
i actually meant all of them - a short anywhere in your lines could "possibly" cause this problem. don't know how likely it is, but i have seen it before
 
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Old Apr 19, 2010 | 01:52 AM
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I went through all 3000 miles of wire on this thing and fixed or replaced all the broken or rusty wires. I still might have missed something, This thing really has me baffled why it won't work, never again am I buying a fuel injected ford worst vehicle I've ever owned, spent more time under the hood then behind the wheel.
 
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Old Apr 19, 2010 | 02:12 AM
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Originally Posted by fepowerguy8
I went through all 3000 miles of wire on this thing and fixed or replaced all the broken or rusty wires. I still might have missed something, This thing really has me baffled why it won't work, never again am I buying a fuel injected ford worst vehicle I've ever owned, spent more time under the hood then behind the wheel.
well.... if you can't fix it and decide to part it out let me know cause i need all kinds of parts for my 86 f150 lol

seriously though i'll see if i can find some more info for you
 
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Old Apr 19, 2010 | 02:59 AM
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ok, go through your fuse box, pull each one, one at a time till your drain stops. Then fine what that fuse goes to and that is your problem.


I had a problem with battery drain that turned out to be a bad horn button, and i found that this way.
 
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Old Apr 19, 2010 | 03:04 AM
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Tried that too and only came up with the radio and I fixed that.
 
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Old Apr 19, 2010 | 03:17 AM
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well... im clueless then. Look at the brite side, at least you have a radio. mine was "borrowed w/o permission" down in winston-salem, nc.
 
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