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Posted: Thu Feb 14, 2008 10:39 pm Post subject: Hot fuse block 75 750F
Can someone offer why Im getting blown 15a fuses and the block is melting? Replaced with another block, but it still gets hot after only a few min of idle time.
Thanks, Terry
Joined: Feb 15, 2007 Posts: 1357 Location: LaPorte, Indiana, USA
Posted: Fri Feb 15, 2008 8:19 am Post subject:
IF they are the tubular type fuses - Many times the old Honda fuses are a different size (diameter) than the replacements you can find at an auto parts store.
Check the diameter of the fuse - it may not be getting good, full contact with the fuse holder.
If that checks out ok, you have a short (or partial short) somewhere - the handlebar switches are immediate suspects.
Joined: Feb 15, 2007 Posts: 1357 Location: LaPorte, Indiana, USA
Posted: Fri Feb 15, 2008 10:39 am Post subject:
A bit more - the metric fuses are 6mm in diameter.
The ones you can commonly get in the auto parts store are 1/4". which is 6.3 mm.
You have to specifically ask for metric fuses - this again assumes you have the cylindrical fuses, not the tab-type.
Joined: Jan 10, 2006 Posts: 158 Location: Green Oak, MI
Posted: Fri Feb 15, 2008 4:48 pm Post subject: Re: Hot fuse block 75 750F
tway20 wrote:
Can someone offer why Im getting blown 15a fuses and the block is melting? Replaced with another block, but it still gets hot after only a few min of idle time.
Thanks, Terry
You have some bad wiring, my friend.
Wires sometimes get corroded at the ends over the years, and as you probably already realize, sometimes weak spots or shorts develop along their length.
I have found myself, that a quick, easy thing to try is to eliminate the last inch or three of wire if possible at junctions to eliminate old, corroded wire that causes resistance (if there is enough spare wire). Sometimes, you might have to add a small jumper segment.
Other than something like that, I'm afraid you'll have to go chasing the length of the wire looking for signs of failure....
...or just get a complete NOS replacement harness... _________________ (1.) '75/'76 KZ400D - Commuter
(2.) '78 KZ750B3 Twin - Commuter
(3.) '78 KZ750B3 Twin - Commuter
(4.) '75 KZ400D - Winterized
Joined: Jan 29, 2007 Posts: 23 Location: Enschede / The Netherlands
Posted: Mon Feb 18, 2008 12:00 pm Post subject:
Although I don't want to be smarter than the rest of us, I think Terry has an other problem to deal with.
If a 15 Amp fuse blows, something is consuming at least 180 Watt.
The bad contacts may cause enough heat to melt the fuse block, but I'm sure something else is drawing too much current.
The problem may be pin pointed by disconnecting anything not really needed to run the engine, and see if the fuse stays in.
Re-connecting the disconnected parts one by one, until the fuse blows, will point to the problem.
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