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Old 08-26-2013, 04:07 PM
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Default Strange electrical problem

I recently installed a new alt, in doing so it was necessary to remove battery. As I disconnected my cabling from battery I discovered that my 25 amp atc fuse to my triple electric fan control box had melted it's plastic off without the fuse ever blowing. It has been operational for 3 years no problems, I never inspected the fuse before so I can't honestly say if it had been melted for a day or 3 years?
As I inspected the fuse holder I noticed it was deformed due to heat and what appeared to be corrosion. That's when I decided to cut off fuse holder and install power cable (12 gauge) directly to an outboard atc teminal block that has 12 gauge input cable. It worked great for about a hour. I then checked fuse and it was fine but the brass in terminal was fried on output side. As motor was running I felt to see if power wire on battery side or fan side of terminal was gettin warm or hot. Neither. The strange part is that only the fan side was fried on both the original and outboard fuse blocks?
I know it's from resistance but from what?
Once again thank's to all the cool peeps here and any thoughts or solutions would be deeply appreciated!
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Old 08-26-2013, 04:18 PM
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I dont really follow your explanation but if you replaced block with new fuse block and same side of block fried as did the last one, then i'd replace the entire wire run from that side to wherever it goes and make sure wherever it's attaching to is free of resistance and corrosion.

I guess the other side could cause the issue too if you want to replace the whole nine yards.

I would replace the block again, measure ohms from batt to other side of fuse block with car off.

Then measure ohms from the fan to the side closest to batt on fuse block.

If they both measure 0.0ohms, then start the car and let fan come on. Wait ~2minutes then remeasure but measure dc VOLTAGE this time at the batteries posts then measure voltage at the fuse block before and after the fuse and at the fan and use ground on batt as ground for all readings.

Once you see a dip in voltage, you know everything behind it is in question.
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Old 08-26-2013, 04:19 PM
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it's a bad fuse.. it should have blown.

I would replace the fuse with the correct size

and install a fused relay so the fuse which melted doesn't experience that load again.
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Old 08-26-2013, 11:32 PM
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Is this on a Chevy or on your jeep?

Is it for the rad fans?

My dad's chevy kept melting the fuse holder for the radiator fans. Never figured it out, just replaced it twice then traded the truck in for a FORD.

All problems solved.



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Old 08-27-2013, 08:57 AM
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Quote:
Originally Posted by 92K1500 View Post
Is this on a Chevy or on your jeep?

Is it for the rad fans?

My dad's chevy kept melting the fuse holder for the radiator fans. Never figured it out, just replaced it twice then traded the truck in for a FORD.

All problems solved.
Jeep, yep. ford stopped making the early bronco! I'm gunna clean up the grounds to the fans. This is why buy'n thru the net sucks! No phone numbers and now 3 days and no email response?
Thank's for the responses peeps
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