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H4 Headlights and relay

 
Old 06-30-2019, 07:16 PM
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shimmey
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Default H4 Headlights and relay

Upgrading to 100 watt H4 headlamps on my 73 2.0. Can anyone recommend the necessary relays I will need to protect my wiring and light switch? Any information on wiring would be helpful also. JWest makes a kit but it is for 911's.
Thanks,
Mike

Last edited by shimmey; 07-02-2019 at 09:57 AM.
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Old 07-01-2019, 11:21 AM
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dr914
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mike h4s plug right in no need for extra wiring. Were an original factory option for the cars in europe
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Old 07-01-2019, 02:56 PM
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shimmey
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Thanks.
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Old 07-01-2019, 11:59 PM
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bkrantz
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Might depend on the bulb. Sealed beams are 30 to 60 watts. A halogen bulb in the same range, like 55 watts, should not be a problem. 100 watt bulbs could cause problems.
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Old 07-02-2019, 12:00 PM
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campbellcj
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Yup typically the trouble is the increased current load running thru the old wiring and switches in an un-relayed circuit, when trying to go to 100W+ upgraded bulbs. If you stick close to OE 55/65W bulbs you should be fine.
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Old 07-06-2019, 06:24 AM
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cairo94507
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Have you considered going to LED headlights? Plug and play with a lot more light and lower draw on wiring than stock headlights. That's what I did on my car. On the 914 it is especially nice as the lights are usually down so the different appearance of the LED is not a big deal.
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