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Should there be voltage at the fuse when the key is off

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  • el22lobo
    el22lobo Apr 25, 2017

    Hi Bruce Godley, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?

    What is the year/make/model/engine for the vehicle?

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At some fuses yes at others no.

Posted on Apr 25, 2017

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1998 chev 1500, 5.0, automatic trany. Why do I have to activate the starter relay by hand to get engine to start?


Have you used a different relay ? Look on the bottom of the relay ,see pin 86 ? Test for B+ voltage where it plugs into the relay / fuse box while someone turns the key to start ! Is there B+ voltage . Before replacing the ignition switch and the neutral safty switch did you test for battery voltage coming from the ignition switch ? Pin 85 goes to ground , you can check this with a ohm meter . Do you know how to use a DVOM - digital volt ohm meter ? In the start position voltage from the ignition switch goes through 10 amp crank fuse . Fuse #8 located in the I/P fuse box .

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The fuses are for base radio system. With key out, check the two outside fuse circuits for voltage. Shouldn't be any voltage, if there is, have to check ignition switch wiring circuits. Use a test lite to check for voltage
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Check for voltage at applicable fuses. Even if the fuse is good, if no voltage at the fuse circuit, the circuit is still dead. Some fuses are hot all the time, some go hot with the key on.

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Did you check for voltage at the applicable fuse/s? Use a testlight and check for voltage at the fuse circuit with key on. The gauges usually get voltage feed from the ignition switch, key on.


I haven't looked at your wiring yet, you may have to check feed to and from ignition switch.

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Did you check for voltage at the applicable fuse, use a test light to check voltage. The circuit goes hot with the key on, so turn on the key then check voltage at the fuse circuit. Go from there.

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The 25amp blower fuse is powered thru the key switch.
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