1969 E Type Series 2 fuses are smoking hot

Talk about the E-Type Series 2

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CGloss
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#1 1969 E Type Series 2 fuses are smoking hot

Post by CGloss » Tue Dec 04, 2018 10:05 pm

Hello, I am new to this forum. I have a 1969 Type E 2+2 4.2L that has been restored . The car sat for several years after restoration. I have managed to get it running with all the lights, flashers, wipers, and even the horn working. While test driving today i noticed some smoke coming from behind the instrument cluster. After inspecting on the side of the road I decided to head back to the shop. From what I can tell, fuse #6 is getting hot enough to melt the insulation around the terminal end. I am hoping for some advise on what to do next. Thank you in advance.

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Tbob
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#2 Re: 1969 E Type Series 2 fuses are smoking hot

Post by Tbob » Tue Dec 04, 2018 11:24 pm

My first guess would be a dirty fuse holder and connector. Clean with a wire brush and contact cleaner. Squeeze it together to ensure good contact.
Last edited by Tbob on Tue Dec 04, 2018 11:44 pm, edited 1 time in total.
Bob t

LHD '69 OTS. (Former) basket case

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abowie
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#3 Re: 1969 E Type Series 2 fuses are smoking hot

Post by abowie » Tue Dec 04, 2018 11:29 pm

Fuses 6 and 7 supply power via green wires.

Originally on an S1 car 6 would supply horn relay, screen washer, fan relay, stop lamp switch. 7 would supply wiper motor, reverse lamp, fuel and choke light and the indicator, plus the 10V regulated supply to the instruments.

Note that S2 cars might be different; I don't have wiring diagrams for them.

With your car there are a couple of possibilities. It may be that one of the devices attached is faulty and drawing excess current. It may be that green wires have been incorrectly moved between 6 and 7 over the years resulting in more current being pulled through one fuse than is correct. It may be that the fuse you have fitted is incorrect in rating or damaged. Finally if you have replaced your fuse blocks with new reproduction ones it has been my experience that the plastic in the repros is softer and I have had them melt and fail.
Andrew.
881824, 1E21538. 889457..oops
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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CGloss
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#4 Re: 1969 E Type Series 2 fuses are smoking hot

Post by CGloss » Wed Dec 05, 2018 2:41 pm

Thank you for your help. I was thinking that possibly the cooling fans might be the issue due to the driver side fan not working. After replacing it, the problem has not changed. There is a brown fused wire also going to my fuse #6. Would it be a problem if I ran an additional fused link from the battery directly to that brown wire in hope of relieving some of the load from fuse #6? Thank you in advance for your time and knowledge.

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Bfastr
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#5 Re: 1969 E Type Series 2 fuses are smoking hot

Post by Bfastr » Wed Dec 05, 2018 4:33 pm

Fuse #6 is a busy fuse in the Series 2. your best bet is to find the schematic at learn what should be coming off that fuse, yes you could isolate things like the fans and run a fused wire just for them, but fans shouldnt be running all the time, so I doubt thats the trouble, and if the in-op fan was shorted the fuse would blow.

as mentioned, clean the contacts and make sure thats not the problem, the fuse will be hot under normal load and thats ok, but it shouldn't melt anything or smoke.

here is a picture of my S2 right side fuse block, maybe it will give you an idea of what should be there.

Bob F
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69 S2 E-type OTS LHD

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cactusman
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#6 Re: 1969 E Type Series 2 fuses are smoking hot

Post by cactusman » Wed Dec 05, 2018 4:54 pm

As others have said it may be dirty connections. Failing that there is an excess load somewhere. I would not recommend adding an extra wire. Fuse six is ignition live and feeds the horn relay, the heater motor, the engine cooling fans, the screen washer and the brake lights. This assumes your car is wired as the factory intended. Wires on one side of the fuse will be white (supply side) and green (load side). If you have air con then it also feeds part of that too. Assuming all is clean then one of these loads is faulty....I would suspect the engine cooling fans. It needs to be resolved as electrical fires can be catastrophic
Julian the E-type man
1962 FHC
1966 MGB....fab little car too

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Heuer
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#7 Re: 1969 E Type Series 2 fuses are smoking hot

Post by Heuer » Wed Dec 05, 2018 5:26 pm

Wiring diagrams are in the Forum Knowledge Base - here you go:

S2 Colour Wiring Diagram (by Bill Molloy): https://www.dropbox.com/s/dx7f9jvz6pvca ... r.jpg?dl=1
S2 harness layout: https://www.dropbox.com/s/djyleznlp0qyl ... m.jpg?dl=1
S2 Dash wiring: https://www.dropbox.com/s/8i1ljkfu1wkl7 ... g.JPG?dl=1
David Jones
S1 OTS OSB; S1 FHC ODB

Add your E-Type to our World Map: viewtopic.php?f=1&t=1810

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Heuer
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#8 Re: 1969 E Type Series 2 fuses are smoking hot

Post by Heuer » Wed Dec 05, 2018 5:26 pm

Wiring diagrams are in the Forum Knowledge Base - here you go:

S2 Colour Wiring Diagram (by Bill Molloy): https://www.dropbox.com/s/dx7f9jvz6pvca ... r.jpg?dl=1
S2 harness layout: https://www.dropbox.com/s/djyleznlp0qyl ... m.jpg?dl=1
S2 Dash wiring: https://www.dropbox.com/s/8i1ljkfu1wkl7 ... g.JPG?dl=1
David Jones
S1 OTS OSB; S1 FHC ODB

Add your E-Type to our World Map: viewtopic.php?f=1&t=1810

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CGloss
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#9 Re: 1969 E Type Series 2 fuses are smoking hot

Post by CGloss » Wed Dec 05, 2018 8:30 pm

i would like to thank all of you who responded to my post. Ya'll have been extremely helpful to me in figuring out this electrical issue. It very well might be the cooling fans. It seems that the a/c blower motor is also running off the #6 fuse. After unplugging the a/c there have been no more problems with the fuse smoking. Although, I have replaced the driver side cooling fan with a rebuilt unit. It seems to be working fine, but I have noticed that the rebuilt fan motor doesn't always come on when it is supposed to. I am under the impression that the a/c was added on as an aftermarket addition. From looking at the wiring diagrams, I have noticed there is only 1 fan relay for both fans. Could this be the overload I am looking for?

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Tom W
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#10 Re: 1969 E Type Series 2 fuses are smoking hot

Post by Tom W » Wed Dec 05, 2018 10:44 pm

There’s one relay that switched both cooling fans, triggered by the otter switch in the radiator. If your car has factory AC, there should be a 2nd really that turns the fans on when the AC’s on, irrespective of the radiator temperature.
Tom
1970 S2 FHC

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Jage70
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#11 Re: 1969 E Type Series 2 fuses are smoking hot

Post by Jage70 » Sun Dec 09, 2018 3:21 pm

Hi CG, I have an 1970 SII "E" OTS that I completely rebuilt from boxes up!! The circuits fed by fuse #6 are numerous .Your only option, after ensuring that all the contacts on the fuse panel are clean, is then to check out each of the electrical items that are on that particular fuse. The items on this circuit are : screen wiper motor and switch : screen washer : all the dash gauges for battery ( voltage) , oil pressure , coolant temp , and fuel gauge ) : stop lamps : heater motor : all lighting flasher circuits : coolant fan relays and the circuits.
When i first realized this some years ago I was very concerned about the potentially high load this circuit might be expected to handle!!! The first thing I did was to feed power by an N wire ( fused ) directly to the coolant fans. This meant that the fans would run on when the ignition was switched off off, and they would stop only when the Otter switch "said so" !
Even having done that , it was also noted that both fuses 6 and 7 are fed by the W wire from the ignition switch. Having R&Red that switch, I felt that the potential combined load from fuses 6and 7 could cause heating issues for it. I now have a power relay activated by the ignition switch W send switched power via a fused N line to feed the relay. Now the power to fuses 6&7 bypasses the ignition switch. In addition , the power for heating the rear window ( if you have one ! ) comes via the power relay and not through the ignition switch!!
While studying the 6/7 fuse circuits, it was clear that the W feed to the ignition and fuel pumpwas not fused..so now an in line fuse is fitted.
So this is probably a lot more than you felt you should know, but please ponder on it at least from a safety view point.Regards, John H, ON Canada.

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