![]() this powers the control side of the starter relay. There is one more fuse that get's B+ power from the ignition switch and ign A fuse ,crank fuse fuse #8 10amp. if the ignition fuse doesn't blow the problem is in one of these other fuse circuits. , Plus trans fuse #20 10 amp ! Pull out these fuse an try to start the van. In the I/P fuse panel the gauges fuse #4 10amp, air bag fuse #10 10amp, turn b/u fuse #16 20amp. Not just the starter relay ! I see five other fuse's that get power from that fuse when ignition switch is in the start or run position. located in the under hood fuse/ relay center ? That fuse feeds B+ voltage to the ignition switch ,which powers up other thing's ,fuse's etc. The fuse that blows ,is it IGN - A 40 amp. Do you know how to find a short circuit ? Video's on youtube show how. ( one question i have is every time the ignition fuse blows do i need to replace the starter relay? ) NO ! You have a dead short to ground on one of the circuits that fuse feeds. You need to isolate the circuits, pull fuse's till the fuse doesn't blow ! Any one of those circuits could have your short. ![]() A/C compressor relay, rear window defroster relay ,daytime running lights. you will also see it powers the igintion switch ,look at last part of ignition switch, when in start or run that 40 amp fuse powers all those other fuse's plus three relays i see there also. You will see Ign A 40 amp fuse at the top of the page. First blue link scroll down to the second diagram. year, make, model an engine, Under system click on electrical distribution, under sub system click on power distribution. That 40amp fuse powers a lot of subsystems ! If you were to jump 30 to 87 in the relay box the starter should spin the engine over, not start an run just spin ! 85 & 86 is the control side. If you pull the relay out of the box it's plugged into an look on the bottom of it you would see four sets of numbers ! 30 & 87 an 85 & 86. Which fuse ? IGN A - 40 amp ,under hood fuse / relay box ? This fuse powers the Starter Relay and Ignition and Start Switchĭoes your vehicle have a manual or automatic transmission ? The starter relay could be shorted inside, It's also located in the under hood fuse box. You need to be careful not to move the loom too much though or you could move it away from where it has been rubbing and you'll never find the fault.īelow are a few photos of a pair of shorts :laugh.I found recently that were the cause of an intermittent misfire on an Iveco Daily.What all does that fused supply B+ voltage too ? Do you know ? That would be your first thing to find out ! Do you know what a electrical distribution diagram is ? Do you know how to test electrical circuits with a DVOM - digital volt ohm meter ? Do you know what a short to ground is ? If the bulb flickers your getting close to where the short is. Now carefully move the loom while watching the bulb. ![]() ![]() If you suspect the wiring is intermittently shorting to ground, the best way to trace the fault is to isolate the wiring then connect a bulb between the wire with the short and battery positive. The engine will move most during crank so if that is when the fuse blows (during an attempt to start the engine) then that's where I'd focus my search. My guess is the wire to the starter would be the most likely to short out since it's attached to a moving engine. I'd ask a slightly different question : does the starter crank the engine a little right before the fuse blows? Click to expand.The IGN fuselink does indeed supply the starter solenoid, via the starter relay, so the engine shouldn't crank when that fuse blows. ![]()
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