My 86 F150 w/inline 6 needs jumping to start.


Asked by Dec 27, 2014 at 01:21 PM about the 1986 Ford F-150 STD Standard Cab SB

Question type: Maintenance & Repair

I have a 86 F150 w/inline 6. I have a problem that started the other day. I had the battery  tested and it is good and I took the alternator to 2 different parts stores and it tests good. It starts if I get a jump or charge the battery.

11 Answers


It does sound like the battery. Did they use a load tester on the battery?


Thanks for the reply. The battery and the alternator was tested. The person at Auto zone told me the alternator was testing bad so I got a jump and went home. On the way home the truck was running just on battery and it almost went dead. I took the alternator off and took it in to have it tested. It tested good. I then took it to Advance and it tested good there too.


I'm sorry ytlas. I don't know what the device was called but the clerk brought out a small hand held tester, nothing on wheels and it tested good. I think it is called


A load tester like I have is rectangular, maybe 4" x 12" and it's hooked to the battery and then a toggle switch is turned. The coils inside the tester get hot because it's putting a load on the battery. If a person uses a multimeter on the battery and it reads 12.5 volts or better, that still doesn't say anything about the cranking amps of the battery. A multimeter is good for checking the alternator. You can put it on the battery when the engine is running and if the meter says 14.5v or better, the alternator is charging. Lot easier than pulling the alternator.


It's like this


It sounds like he used the load tester and not the multimeter, I know what that is.


If you have another vehicle, how about taking that battery and sticking it in your truck to see if it fires? That should prove once and for all whether it is or isn't the battery


I am now waiting for my friend to come over and put the alternator back in.

1 people found this helpful.

If you're still having problems, it might be a bad voltage regulator.

1 people found this helpful.

I found the problem. A loose connection at alternator. Thanks for the assistance everyone


Change your starter the starter can short out and burn alternator and battery both up if it has a solenoid on firewall it very well could be it but I personally would start with the starter

Your Answer:


Looking for a Used F-150 in your area?

CarGurus has 199,220 nationwide F-150 listings starting at $1,300.


Ford F-150 Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Ford Mustang
296 Great Deals out of 39,978 listings starting at $1,312
Used Ford F-250
398 listings starting at $3,495

Used Cars For Sale

2018 Ford F-150 For Sale
119 Great Deals out of 126,069 listings starting at $17,290
2017 Ford F-150 For Sale
141 Great Deals out of 8,069 listings starting at $16,001
2016 Ford F-150 For Sale
233 Great Deals out of 9,637 listings starting at $14,500
2015 Ford F-150 For Sale
301 Great Deals out of 11,512 listings starting at $9,950
2014 Ford F-150 For Sale
357 Great Deals out of 10,040 listings starting at $7,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.