melted relay

[123abc]

im running a fg single fan normaly run on half speed now with new engoine and ac it struggles to cool i started to run it on high speed with a 30amp relay 30amp fuse with i think 50amp wire after 4 or 5 cut in and out cycles the fuse melted didnt blow just melted the blade fuse thinking maybe going to a 50amp relay and 50amp circuit breaker or should i go 70 amp just be safe apparently these fans draw big amps when started from dead stop

[unilec5544]

You need to determine what the current draw is, so if you know someone with a DC clamp meter or tong tester, you will know exactly the current draw. If not just drive in to a local auto spark and get them to tell you.

[123abc]

i have a clamp meter so just put it on and activate fanput it on the fan cable correct

[hybrid]

I'm running the big single fan on a regular relay without issue.
Is yours genuine?

[123abc]

no its not a genuine one i think i may have found the issue a couple of the terminals were a bit loose in the plug which could explain why the fuse was heating up, it was a fuse and relay in one im going too put a new relay and sep fuse on next week a 50a and fuse will do fine, i got 45 amps on my clamp meter but other forums have said they can be as high
as 70a on a hard start

[hybrid]

I would have to double check, but pretty sure I have a 30a fuse.

[123abc]

going to an auto elect tomorrow to get what i need just checked again and it spikes to 54 amps on start then goes back to a steady 23a while running i think it just needs better quality terminals and relays to be honest the crap i am using is junk it was supplied with a fan kit i got a few years ago

[66STNG]

It sounds more like a hot joint, which Causes heat. If the current was exceeding the fuse it would have blown, not melting it. Make sure all connections are tight with no play..

[lukep6470]

yep 30amp fuse, relay and single 18" fan, done 20,000 miles no problem.