100W high beams in '98 V70

  • Thread starter Thread starter Jeffrey C Honig
  • Start date Start date
J

Jeffrey C Honig

I just installed some 100W H7 high-beam bulbs in my '98 V70. I'm a
bit concerned about the current capacity of the wires. Has anyone had
any problems doing this?

Thanks.

Jeff
 
A while back I had a '93 850 T5 estate - lovely car. Now replaced with a
2000 V70 T5

I had a load of problems with the headlights - the beam alignment was poor,
they failed fairly quickly, and I had TERRIBLE trouble getting the retaining
clips back on after I replaced the bulbs.

One day, I took the headlight out to see what was wrong.

The alloy bulb holder had very clearly become warped - the new bulbs
wouldn't sit down flat, and the clips would not clip.
I bought 2 new ones from the main dealer (luckily they didn't make me buy
whole headlight assemblies) and everything worked again.

I ASSUME a previous owner had used 100w bulbs.

So beware - it may not be the wiring or fuses that give you the problems!


Bob
 
Bingo said:
A while back I had a '93 850 T5 estate - lovely car. Now replaced with a
2000 V70 T5

I had a load of problems with the headlights - the beam alignment was
poor,
they failed fairly quickly, and I had TERRIBLE trouble getting the
retaining
clips back on after I replaced the bulbs.

One day, I took the headlight out to see what was wrong.

The alloy bulb holder had very clearly become warped - the new bulbs
wouldn't sit down flat, and the clips would not clip.
I bought 2 new ones from the main dealer (luckily they didn't make me buy
whole headlight assemblies) and everything worked again.

I ASSUME a previous owner had used 100w bulbs.

So beware - it may not be the wiring or fuses that give you the problems!


Bob
Click to expand...

That was my concern - that the sockets or mounting would suffer. 10 AWG wire
should handle the current okay and it is pretty standard for headlight
wiring, but the socket contacts and any plastic near the lamps are usually
underengineered.

High currents are the most common reason for connector contacts to fail.
They start with a chicken/egg situation - it's hard to say whether heat
comes first or the contact tension is too low. Anyway, one leads to the
other, and so on until the contacts get hot enough to oxidize. The whole
thing heads south in a hurry from there.

Mike
 
I would consider heavy duty harnesses, somehere on the net someone offered
them, maybe IPD.
 
A while back the lighting guru Daniel Stern would be giving you a rollocking
by now for using overrated bulbs. Here is his sight.

I have run 100/90w bulbs in a 740 and also a 760 but never gone beyond the
standard 6/55w H7's as I believed the reflectors were polycarbonate and
might be damaged if they got too hot. On both the 740 & 760 I did not have
a problem.

Whatever you do make SURE that the 3 contacts to the bulb are crimped really
tight or you will get heat at the connection block due to resistance. This
will also most likely cause a voltage drop and you could end up with an
effec tive lower light output that using orig bulbs.

Assuming you are ok with potential damage to the reflector - and if it
already getting dull then I suppose you have little to loose - and you are
hell bent on using the 100 W bulbs do be sure to check that the lighting
relay will take the current.

I have noticed that the 100w bulbs have a tendency to blacken quicker than
regular 60/55w bulbs so you may have to change a bit more often. I always
keep a spare with me in the glove box.

Andy
 
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