Re: 86 Bronco no voltage to fuel pump, a little help please
> CJB wrote:
>> "Shoe Salesman" <email@example.com> wrote in message
>>> "CJB" <firstname.lastname@example.org> wrote in message
>>>> I had an identical problem on my Father-in-Law's 86 Bronco. Turns
>>>> out that one of the negative for the fuel pump is fed straight from
>>>> the negative battery terminal. It was one of those smaller leads
>>>> coming from the post clamp. Anyway, it was simply a crimp connector
>>>> that wasn't tight enough and over time had lost continuity all
>>> I think you are talking about the neg for the computer. Ford used to
>>> put that little black wire right near the battery. It had a connector
>>> right there too that would corrode because of battery acid.
>>> Definitely worth checking for on this truck.
>> Frankly, I found it doing a wiggle test, so I wasn't sure what exactly
>> was fed by that neg. I know the fuel pump relay, and therefore the
>> fuel pump, wouldn't energize when the connector was open, which was
>> much of the time.
>> It's interesting that before I found the problem, a garage told my
>> father-in-law that he needed a new computer for that truck. I guess
>> they couldn't get any output from the computer, and therefore
>> diagnosed the computer as dead.
>> One more thing I should mention too. I had an 88 Crown Vic that would
>> have used a similar relay to feed the power to the fuel pump. I went
>> so far as to replace the fuel pump (like an idiot) and found that the
>> new pump wouldn't work either. Turns out the relay harness itself had
>> an intermittent connection.
> that ground.... it grounds the negative side of the main ecm relay coil
> .. no ground no ecm
> bought a truck years ago .. didnt run paid small sum of money ... fixed
> ground and presto
It's funny, sort of. Most folks will keep the B+ side (the wiring and connectors you
see) spotless, but don't understand the B- (body ground) side of things. The entire
body\frame\engine of the vehicle is the return path to the source (battery). Years ago
an old timer explained it to me simply. The whole car is one big cable going back to
the battery. If the path is blocked or open, you got problems. I've never forgotten that.