Fuse box getting hot (Page 7) : TR6 Tech Forum : The Triumph Experience

Re: Fuse box getting hot #91
tirebiter Jeff Garber Southeastern, MA, USA Sign in to contact 1973 Triumph TR6 1980 Triumph TR7 Drophead "My New Toy"	Aug 3, 2024 08:28 PM Top Contributor Joined 18 years ago 17,625 Posts

In reply to # 2058430 by Oldkartracer Just to put this in perspective, a 300 mv voltage drop across a 12v fuse is dissipating about 7 watts at 23 amps. Ever grab an old style outdoor Christmas light? I'll bet it didn't take long to look at it :< winking smiley

My money is still on the fuse clips and connections.

Alan,
Would you please share the formula you used to derive 23 amps at battery voltage across the fusebox with a 300 millivolt drop ?

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Re: Fuse box getting hot #92
brucejon Bruce Jones Santa Cruz, CA, USA Sign in to contact 1960 Triumph TR3A 1969 Triumph Spitfire MkIII 1972 Triumph TR6	Aug 3, 2024 09:27 PM Top Contributor Joined 16 years ago 7,277 Posts

I think he just fat fingered 2.3 as 23.

VxA =W
.3v x 2.3A = 6.9W which is approx 7W

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Re: Fuse box getting hot #93
Oldkartracer Alan Strihafka St Simons Island, GA, USA Sign in to contact 1980 Triumph TR8 "DOORSTOP" 2005 Mercedes-Benz SLK55 AMG	Aug 4, 2024 08:29 AM Joined 5 years ago 50 Posts

In reply to # 2058657 by brucejon I think he just fat fingered 2.3 as 23.

VxA =W
.3v x 2.3A = 6.9W which is approx 7W

I try to check my calculations by mentally approximating the answer. In your example, the formula is correct but the answer is 0.69W. 3x2 is 6; point3x2 is point 6.

I stand by my answer. And don't hold onto that bulb for very long!

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Re: Fuse box getting hot #94
brucejon Bruce Jones Santa Cruz, CA, USA Sign in to contact 1960 Triumph TR3A 1969 Triumph Spitfire MkIII 1972 Triumph TR6	Aug 4, 2024 11:46 AM Top Contributor Joined 16 years ago 7,277 Posts

Whoops I missed the decimal place

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Re: Fuse box getting hot #95
Oldkartracer Alan Strihafka St Simons Island, GA, USA Sign in to contact 1980 Triumph TR8 "DOORSTOP" 2005 Mercedes-Benz SLK55 AMG	Aug 4, 2024 12:08 PM Joined 5 years ago 50 Posts

In reply to # 2058750 by brucejon Whoops I missed the decimal place

Said the Hubble space telescope engineer smiling smiley

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Re: Fuse box getting hot #96
Oldkartracer Alan Strihafka St Simons Island, GA, USA Sign in to contact 1980 Triumph TR8 "DOORSTOP" 2005 Mercedes-Benz SLK55 AMG	Aug 4, 2024 03:34 PM Joined 5 years ago 50 Posts

In reply to # 2058750 by brucejon Whoops I missed the decimal place

Said the Hubble space telescope engineer smiling smiley

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Re: Fuse box getting hot #97
tirebiter Jeff Garber Southeastern, MA, USA Sign in to contact 1973 Triumph TR6 1980 Triumph TR7 Drophead "My New Toy"	Aug 5, 2024 05:49 AM Top Contributor Joined 18 years ago 17,625 Posts

In reply to # 2058701 by Oldkartracer

In reply to # 2058657 by brucejon I think he just fat fingered 2.3 as 23.

VxA =W
.3v x 2.3A = 6.9W which is approx 7W

I try to check my calculations by mentally approximating the answer. In your example, the formula is correct but the answer is 0.69W. 3x2 is 6; point3x2 is point 6.

I stand by my answer. And don't hold onto that bulb for very long!

I was asking about the formula you used to determine amperage from 300 millivolts drop starting at battery voltage. I was not asking about the formula to determine watts.

Alan,
What formula did you use to get amps assuming 12V battery voltage and given a 300 milivolt drop ?

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