electrical problem
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Senior User
Joined: Jun 2011
Posts: 111
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From: Deltona Fl
electrical problem
electric dummy here I have a 1972 f100 and received the truck not running . I have no power to anything under the dash including the ignition switch . I have power to the one side if the starter solenid that the battery cable connects to. The question I have should I have power on the I post? Is that what supplies power to under dash?
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
electric dummy here I have a 1972 f100 and received the truck not running . I have no power to anything under the dash including the ignition switch . I have power to the one side if the starter solenid that the battery cable connects to. The question I have should I have power on the I post? Is that what supplies power to under dash?
Logistics Pro
Joined: Nov 2012
Posts: 4,308
Likes: 19
From: Las Vegas, NV
no. if you have no power into the cab you have either a blown fuse or broke/missing connection. You should have the main + battery cable connected with 3 other wires on the same terminal large terminal. one wire from the ignition to a small post. The large starter wire on the other large terminal by itself. the power for the cab comes off the post the battery is connected to. Start there, and check the wires.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
Cab power is supplied by a black wire with a yellow trace on the hot side of the solenoid. Check Mr. Fusible Link!
You have a multimeter, right? There is no excuse to not have one.. Harbor Freight has coupon for free ones with like a $20 purchase. I've got five of them... one in each work area, one in a troubleshooter box, one in an electrical tool box, and one in the junkyard toolbox.
You have a multimeter, right? There is no excuse to not have one.. Harbor Freight has coupon for free ones with like a $20 purchase. I've got five of them... one in each work area, one in a troubleshooter box, one in an electrical tool box, and one in the junkyard toolbox.
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
Most likely the fuse link as suggested. However there is no way we can tell how you are testing. If using the neg battery term as your ground, the neg battery lead could still be bad where it connects to the engine block. Worth checking, if only for good maintenance.
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Senior User
Joined: Jun 2011
Posts: 111
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From: Deltona Fl
Ok thanks I found a 3 wire plug - 1 wire being black/yellow - I connected a jumper from positive post to that wire and YEA I have power - so what does the red and yellow wires go? There must be a harness that plugs into those 3 wires but did not come with the truck.
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Hotshot
Joined: Mar 2013
Posts: 14,255
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From: Phoenix, Az.
Yep. There's your problem. Find a harness from a donor truck at a local wrecking yard or make one up. Make sure you incorporate fusable links. Available aftermarket or from Ford. I believe they are 18 gauge.
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Fleet Owner
Joined: Dec 2009
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From: NorCal
Doin' this from memory but I'm thinkin a yellow wire with a red trace goes to the horn(s)... that's why it doesn't show on the diagram above which is specifically for ignition, starting, charging, & gauges.
