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Ill start i search the 80 post for ing a fuse nothing close to the problems im having. Ill start i 2 boys that needs this suburban greatly we drive ruffly 30 miles monthly for my two boys that have a life threatening Muscle dystrophy Duchenne . We need this rig. we cant afford to take it to a shop for 90 a hr so i do everything i can. Ive done alot on older rigs but these newer ones well.im confused…. so ill start we got home the other night . went out to start the rig .nada lights are on everything seams fine. but no crank first i started with the fuses found under the hood ING A fuse(Manual says the fuse is for Ignition switch) is blown. So i grab a New 40 fuse soon as it touches the clips it Blows so i .disconnect the battery and try again soon as the neg- touch Blows again. So i think there is a Positive grounding out. So i start at starter removed started needed replaced so i did that wires was fine from there up. so i called my wifes uncle he came over looked it over said that my fuse block is bad smells but so i got a new one. replaced all fuse got to the the battery and bam blew that dam fuse again!.. I cant see any wires melted anywhere. and i have a doctors appointment next month for these boys… what can i do to find this problem?
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I read about an issue like this once and it was a bad ground, unfortunately i cannot remember where it was.
You are instantly blowing “IGN A” Fuse (40Amp) correct? I’ll see what i can do about a wiring diagram and we can see what it powers and see where your short is that’s causing this fuse to blow instantly.
Here is a wiring diagram for that circuit:
Wiring diagrams are not my strong suit, but it looks like IGN A (which is blowing instantly) is power to the starter relay. The ignition switch looks to be leading to the control side of the relay, which is activated by ground.
The first thing i would try is pulling out the starter relay and then putting another fuse in and seeing if it blows.. that way we can take the relay out of the equation. Im sure so more experienced guys will chime in here shortly. But I believe this is a good start.
Yea tried that, still popped fuse i had all new fuses with the new fuse panel … even disconnected the alt to take out of the proublem i did put a test light on the blown fuse and for some odd reason with fuse out i have power on each side ?
Judging from the wiring diagram you should have power at all times. One coming from the battery, and the other side is the power side of the relay, which is only switched by ground on the control side of the relay with the ignition switch.
I know you said that you changed the starter. But double checking the purple wire to the starter, would be the next thing I would suggest. If that is grounding out somewhere it’ll definitely cause the fuse to pop.
EDIT: I just realized that you said you pulled the starter relay, and it still blowing the fuse. If that’s true, then the purple wire is no longer part of the circuit, and should not be causing your problem.
Is it possible to swap out an identical relay to the starter relay position? Look for part numbers on the relay and find one that matches the starter relay numbers. If so, try swapping out something like the horn and the starter relay and see if it still blows the fuse. But I would think if the starter relay was stuck closed, the starter would never shut off as soon as you turn the key on. But it’s already blowing the fuse before that can happen regardless.
Please keep in mind as I said before electrical diagrams are not an area of expertise for me. I’m still waiting for someone else to chime in with some more ideas.
First remove the start relay. If the fuse don’t blow when relay removed, replace relay. If that don’t work follow the wire to and from the relay.
Still no success? Remove 40 amp fuse and make a bypass wire with a button, new fuse. (maximum 6 inch from positive battery terminal)
Remove original wire (the thin one) from the starter motor solenoid and replace with “dirty fix”.
At least you should be able to start your car, if no other problems are apparent.
Hope this helps.So your saying i should for a dirty fix wire the starter Derby style? like you would a old motor? Cause on my first test on old starter i tried jumping the starter it wouldn’t kick out but it would turn? Plus my didgital mileage isnt showing along with the gear selection?
Then I’m afraid you have to follow exactly what that fuse is connected to. You might not have any power to the ecu and then the car wont start even if you get the motor to turn over with the dirty fix. Looking at the circuit diagram above shows that the “IGN A Fuse 40A” is only connected to the “starter motor relay”. If you remove the starter motor relay and the fuse still blows, then there is a reason to follow that particular wire between where pin 30 of the relay connects and the one of the fuse connection. Then you can see if that fuse is used for something other than pin 30 of the relay.
To save fuses. Use something like this to troubleshot. Remove the “IGN A Fuse 40A” and connect the bulb where the fuse go.
The bulb should not be glowing as long as you don’t turn the ignition switch over to “start”.
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