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#16
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Yeah you would need to look at the I^2t characteristic of the new metal combo. If that solder melts (phase change is a great way to remove heat) for example, it could allow excess current to flow longer.
Id almost be more inclined to put a 16-18ga jumper without insulation in there than a soldered fuse. Something that will indeed melt at overcurrent... THough Vdrop will likely be large. Just get the right part... If you can find a really HD fuse holder that uses a standard ATC fuse, you may be able to get away with that... But Id want the leads to be 10ga or heavier...
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (113k) 1991 350SD (206k) 1991 300D (228k) 1993 300SD (291k) 1993 300D 2.5T (338k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (265k) Past Diesels: 1983 300D (228K) 1985 300D (233K) |
#17
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Just to be clear: I'm not saying that continual use of a jumper is a good idea. I'm saying that sometimes these fuses fail and an immediate replacement is not available and the engine needs to be started and won't start without the glow plugs. In those circumstances, jumping the terminals is a good idea. A better idea is getting a supply of the 80 amp fuses in advance and keeping them in the glove compartment
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#18
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Quote:
I'd want at least #8, preferably #6 to be able to handle an 80 amp maxi fuse. remember, the circuit only has 80+ amps on it for a second or two, after that, the amperage drops to around 30 amps, so the fuse needs to be time delay, 80 amp max. I think a time delay 60 amp maxi fuse would work, as the strip fuse is likely designed to fail at a certain temp when the amps hold over 50 amps for x seconds... and a maxi fuse is designed to handle it's rated amps for a long time... look at the size wire feeding the GP relay... it's nearly #6 in size. I do know that when the 5cyl loops are upgraded to pencil, #10 works to feed them, but there are dangers with the first short section of that system. a maxi fuse holder change, should be large enough to prevent heating of the supply wire, and not melt the relay, or the fuse holder...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#19
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I would rather solder it then jump it with a wire, any wire.
Quote:
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#20
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when a wire used as a fuse fails, it gets unbelievably hot. white hot in actuality, that's THOUSANDS of degrees... when a fuse material fails, it only gets as hot as the metal it's made of will melt at.
I totally agree, a soldered fuse would be safer than a copper wire. but a jumper wire attached for starting, with the hood open, and you standing there, and removed when the car is started, is my choice, rather than going to the trouble of soldering an old fuse.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#21
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I'd question why it blew...
I'd look for any chaffed or bare wires on the GP harness. I don't think a bad GP would cause it to blow...
__________________
1987 300TDT 1981 VW MKI Caddy 1.6 diesel, waiting on engine swap 1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel assorted gas powered crap and motorcycles RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5 |
#22
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Maybe it didn't blow, it just broke. Heat stress fracture.
Make sure there's a little slack or "dip" in the new strip fuse when you tighten down those 2 screws. It needs expansion and contraction space as it heats up for each use. A fully taut fuse can heat stress itself into two parts much sooner and die an early death... before it ever fails for carrying over-current for too long which is the normal failure - or would that be success? - mode of a fuse. Look into an ATC fuse you see the serpentine shape inside the plastic window, same reasoning.
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Cheers! Scott McPhee 1987 300D |
#23
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Quote:
__________________
1987 300TDT 1981 VW MKI Caddy 1.6 diesel, waiting on engine swap 1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel assorted gas powered crap and motorcycles RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5 |
#24
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GP fuse blew because of over current. Over current is caused by, very likely, one of the 12v feed is touching the chassis. BTDT.
The fuse will work for a long time whether it is screwed on taut, pre-bended, slight dipped or whatever. Use your common sense as there is nothing to it. A fuse is a fuse and how it is screwed on should not make a difference. It is possible for a fuse to develop a hair line fracture, but it is very different from a blown 80A fuse. A blown 80A fuse would have a 'big' crack, you cannot miss it.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#25
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Indeed, it's hard to miss anything having a big crack! Ahem.
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Cheers! Scott McPhee 1987 300D |
#26
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Another option would be to replace it with a "maxi" fuse holder and fuse, thus modernizing the system a bit. Or even a DC automotive circuit breaker -- they're surprisingly cheap.
__________________
1981 Mercedes 300TD, 1994 Honda Civic Del Sol http://mefi.us/images/fuelly/smallsig-us/67195.pnghttp://mefi.us/images/fuelly/smallsig-us/103885.png |
#27
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#28
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NEVER, EVER use a higher rating fuse.
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As I have said, in a pinch, you can solder the blown fuse as long as there is a section of old fuse in the circuit. I am not advocating this practice but it is doable in 5 minutes when you need the car and the new fuse is not there yet. Obviously replacing it is the best solution, <$2 part. Bottom line - have I done it before, Yes. Would I do it again when I have no new fuse, Yes.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
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