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Old 01-10-2005, 06:24 PM
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91 S10 wont start.

My cousin was switching a radio and installing a horn. The way he explains it the radio had nothing to do with his no start problem. He switch radios with the engine running, never died or anything. He cut some wires for the horn and wired it up to a toggle switch, he did this with the truck off. The horn worked fine then he went to start it and it just cranks. I looked at his fuses and the fuse panel was a mess, all the wiring under the dash was terrible. But what i did notice is one of the wires for the horn he put in for a 12v source was jammed into the ECM fuse slot. I pulled the fuse and it was blown. What should i test for first? its a 4.3, in a 91 chevy s10, automatic. Right now it just cranks, no spark. He did try to put an ignition module on it, and no luck...go figure hes a tard

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Old 01-10-2005, 06:31 PM
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Did you replace that fuse? Chances are he was doing the old tap into the ECM fuse and blew it. Replace the fuse and put the wire somewhere else
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Old 01-10-2005, 06:34 PM
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Im sorry i forgot to mention i took a fuse from another slot, like interior lights or something minor and tried it and nothing.
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Old 01-10-2005, 06:49 PM
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Well I believe the thing to do would be get a test light and start checking the fuses that way, if you find one with no power that should give you a better idea. It is also possible he burned up some fusible links. Hope that helps.
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Old 01-10-2005, 06:50 PM
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sure he didn't blow some kind of fusible link? that would be my next guess if all the fuses are good.
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Old 01-10-2005, 06:51 PM
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Quote:
Originally posted by my350camaro84
sure he didn't blow some kind of fusible link? that would be my next guess if all the fuses are good.
lol that thought occured to me right after i posted and i went and edited my post and when it returned you posted that.
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Old 01-10-2005, 07:28 PM
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You could call the Psychic Friends Network or go get a wiring diagram.

Check for voltage at the coil and work your way back to the ignition switch. Check for power to the computer. Check for power to the ignition switch. Check for a bad ground to the computer. Check that the injectors are pulsing fuel.
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Old 01-10-2005, 07:45 PM
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Make sure he doesn't have some old alarm system with a interrupter circuit killing a vital power wire or ground. We see that alot at our shop.
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Old 01-10-2005, 08:13 PM
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I'll bet ya that he folded the wire over the bottom of the blade on the fuse and when he pushed/forced the fuse back into the fuse block he ended up spreading the tabs on the bus. So now that you've pulled the wire out and replaced the fuse the one blade no longer makes contact in between the tabs. No contact with tabs=no power. If he did this on fused side of the circuit, it will still trigger a test light if the fuse is good.
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