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Old 04-05-2018, 08:42 AM
97 SL320 97 SL320 is offline
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Join Date: Jan 2012
Posts: 7,534
A few things to check regardless.

Check voltage at the bulbs with them plugged in, turned on and engine up to driving speed. Older cars generally have a lower charging system voltage, switches / connectors build up resistance due to worn contacts , poor grounds and wiring may be undersized. This leads to dimmer bulbs.

Also check charging system voltage at the battery, the alternator regulator may need to be fooled into thinking it needs to produce more voltage.

If you do go with higher wattage bulbs, consider using a dedicated _fused_ power feed from the battery and relays to power the lights so you don't overload the cars existing system. This way the headlight sw turns on a relay then the power comes from the battery. All of this can be done without cutting the harness, just make a new harness that plugs into the existing stuff.
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