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EFV-8 Club Forum / Light Commercial Truck Discussion / 51 F1 circuit breakers

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Posted By Discussion Topic: 51 F1 circuit breakers

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PeterFord
11-04-2018 @ 1:46 PM
New Member
Posts: 125
Joined: Jan 2011
          
all my electricity is out. During starting it just went blank, lights, everything. Battery OK cables OK, all wiring is new. The circuit breakers are tucked up under the dash, almost impossible to reach. Any help here? Do the circuit breakers protect everything, lights, ignition etc?


Many thanks. Peter

cliftford
11-04-2018 @ 4:15 PM
Senior
Posts: 845
Joined: Jan 2014
          
Does the engine crank over? If not there is a problem other than circuit breakers. Are the battery connections Squeaky clean? If it cranks over check all connections from the battery to the circuit breaker[s]

PeterFord
11-04-2018 @ 5:09 PM
New Member
Posts: 125
Joined: Jan 2011
          
It will not crank, completely electrically dead. I put on new battery cables. Multimeter shows continuity to the solenoid . Haven't been able to check further to the breakers owing to the almost impossibility of reaching them. They are tucked so far up under the dash. I am 6'2" and can hardly twist myself into the cab to see them I (I am also 78).

I have the complete electrical diagram here (I rewired the entire truck 2 yrs ago). It appears that the only thing that could disrupt the entire truck is the breakers. Save me.

GK1918
11-05-2018 @ 2:28 AM
New Member
Posts: 122
Joined: Aug 2016
          
Hope I am reading this correctly: If original 6vt pos ground:
I think you lost the "house power" we call it. Its the main feed for
everything =its like 10 gauge wire from the hot side of solenoid
to the dash it feeds the ignition which feeds the coil. This hot feed also
goes to the breaker which feeds lights. All things like directional s, heater
radio- cigar lighter- all have a inline fuse. The start circuit works by
grounding the start terminal on solenoid. So with jumper wire jump
that terminal to the block=engine should turn over. If it does not turn
over with start button = the cab either lost its ground or start button
lost its ground or its just bad. OR with test light, hook that to hot side
of battery and touch the fire wall- should light up if ground is good. Or jump the firewall to the block try that. I have serviced these trucks
since they were new up to now I have 7 of these. Note if truck is 12vts
neg ground none of this apply's whole different story. Oh forgot your
main question breaker has nothing to do with ignition lights and maybe the horn relay Peter..........Sam

PeterFord
11-05-2018 @ 9:09 AM
New Member
Posts: 125
Joined: Jan 2011
          
It is 12 volt. Now what:)

PeterFord
11-05-2018 @ 9:13 AM
New Member
Posts: 125
Joined: Jan 2011
          
there is power getting to the ignition switch and to both sides of the circuit breakers. No power reaching the lights.

PeterFord
11-05-2018 @ 9:22 AM
New Member
Posts: 125
Joined: Jan 2011
          
correction. There is power to the light switch input. But they won't turn on. Something tells me your suggestion of a grounding [problem is right. But I have grounded this system every which way to avoid just such a problem. I will continue searching for the possible ground issue

alanwoodieman
11-05-2018 @ 2:28 PM
Senior
Posts: 864
Joined: Oct 2009
          
check ground wire from cab to frame and to engine and back to battery. circuit testers will show continuity even thought the ground will not carry the load

alanwoodieman
11-05-2018 @ 2:28 PM
Senior
Posts: 864
Joined: Oct 2009
          
check ground wire from cab to frame and to engine and back to battery. circuit testers will show continuity even thought the ground will not carry the load

PeterFord
11-05-2018 @ 7:46 PM
New Member
Posts: 125
Joined: Jan 2011
          
My apologies. I tested the voltage of the battery with a multimeter which registered 12.5 volts. I thought that ruled out the battery. I called a trusted mechanic and he said "take the battery to NAPA and have it tested". I did. The test result came out of the computer, "Replace". The battery was completely useless. Got a new one and all the electricity is back. Dumb me. But thank you for your generous replies

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