John,
I just helped a guy last week with the same problem in his MGB.....turned
out to be a bad bulb that was grounding in one of his front parking light
socket assemblies. Here's what we did to trouble shoot: remove the fuse and
the
red/green wire (spade) from the "red fuse" fuse position; leave the red wires
connected to the fuse position; set your multimeter to the "buzz" setting
(that's the position that sounds a buzzer in the meter when the test leads are
touched together); touch one test lead to the spade connectors where the red
wires are connected on the fuse box and touch the other test lead to a good
body ground or your battery ground since it's right there; if the meter
buzzes,
you've got a confirmed short to ground somewhere in the marker light circuit.
Now the fun part.....isolating the bad bulb or bad socket. Leave the fuse
out; start with the nasty rear tailight sockets - they have a reputation for
getting funky; pull one socket out - check with meter back at the fuse box for
a "buzz"; repeat the buzz test for the next socket and so on moving to the
front parking lights. I've never encountered an electrical problem with the
side marker lamps so you can save them for last in your process of
elimination.
Good luck....
Chip Krout
Delaware Valley Triumphs, Ltd.
Skippack, PA
1976 TR6 CF57822U
In a message dated 6/5/2008 7:11:45 P.M. Pacific Daylight Time,
jmcoh@comcast.net writes:
I am blowing red fuses immediately when
I turn on the parking lights.
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