87 d150 losing power to coil when cranking

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Old 12-14-2019 | 12:26 PM
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87 d150 losing power to coil when cranking

I have a 87 d150 with a slant 6 and a manual transmission. When I first crank the truck I get maybe 1 to 2 sparks then nothing. Hooking up a volt meter shows its getting power to the coil at first but something is killing the power when its cranking. I ran a jumper wire from the battery to the ignition coil and it fired right up. Once it's running you can take off the jumper wire and it will stay runnin . Only loses power when its cranking. Is there some kind if safety switch that would be doing this? Thanks for any help
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