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post #1 of 20 (permalink) Old 07-30-19, 07:02 AM Thread Starter
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no power

87 f150 no power to coil I put a new coil, module, computer and relays what could it be if I run a jumper wire to either side of coil relays click but no spark to dist

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post #2 of 20 (permalink) Old 07-30-19, 08:08 AM
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Re: no power

Is there power to the coil when it's cranking? Here's the diagram.
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post #3 of 20 (permalink) Old 07-30-19, 08:49 AM Thread Starter
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Re: no power

nope
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post #4 of 20 (permalink) Old 07-30-19, 09:24 AM Thread Starter
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Re: no power

I'm not good at wiring buy it looks like but it looks like a orange wire from the starter to the module should power the module to put power to the coil.correct
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post #5 of 20 (permalink) Old 07-30-19, 06:32 PM
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Re: no power

Power from the ignition switch is what powers it when cranking. That wire is red/light green. Then when running, the same wire gets power in that same wire through the resistor.

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post #6 of 20 (permalink) Old 08-03-19, 09:36 AM Thread Starter
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Re: no power

Thanks Bert I got it running thanks to that diagram there was no power from the switch so I jumped it from the battery. I have to get a switch now it runs fine sitting there but when I went to move it there was no power and popping is that because I have it jumped and not a switch? I was looking at the diagram wrong at first then I saw the r/lg wire turns to w/lb.
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post #7 of 20 (permalink) Old 08-03-19, 03:54 PM
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Re: no power

Are you jumping it at the switch? That power has to go to the module and through the resistor too.

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post #8 of 20 (permalink) Old 08-04-19, 07:15 AM Thread Starter
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Re: no power

I'm jumping it about 6 inches from the module
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post #9 of 20 (permalink) Old 08-04-19, 08:06 AM
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Re: no power

It needs to go through the r/lg so the resistor feeds the coil. Get the switch and see if things work out. The coil shouldn't get the full voltage when running.

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post #10 of 20 (permalink) Old 08-04-19, 08:21 AM Thread Starter
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Re: no power

okay thanks
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