Effects of the 7th house lord in various houses in a horoscope:

If the 7th lord is in the ascendant, the native will go to others’ wives, be wicked, skillful, devoid of courage, and afflicted by windy diseases.
If the 7th lord is in the 2nd, the native will have many wives, will gain wealth through his wife, and be procrastinating in nature.
If the 7th lord is in the 3rd, the native will face loss of children and sometimes with great difficulty there will exist a living son. There is also the possibility of birth of a daughter (who will sustain).

If the 7th lord is in the 4th, the wife of the native will not be under his control. He will be fond of truth, be intelligent, and religious. He will suffer from dental diseases.
If the 7th lord is in the 5th, native will be honorable, endowed with all (i.e. seven principal) virtues, always delighted and endowed with all kinds of wealth.
If the 7th lord is in the 6th, the native will beget a sickly wife, be inimical to her, given to anger and devoid of happiness.

If the 7th lord is in the 7th, the native will be endowed with happiness through wife, be courageous, skillful, and intelligent, but only afflicted by windy diseases.
If the 7th lord is in the 8th, the native will be deprived of marital happiness. His wife will be troubled by diseases, be devoid of good disposition, and will not obey the native.
If the 7th lord is in the 9th, the native will have union with many women, be well-disposed to his own wife, and will have many undertakings (or assignments).

If the 7th lord is in the 10th, the native will beget a disobedient wife, will be religious, and endowed with wealth, sons, etc..
If the 7th lord is in the 11th, the native will gain wealth through his wife, be endowed with less happiness from sons, etc., and will have daughters.

If the 7th lord is in the 12th, the native will incur penury, be a miser, and his livelihood will be related to clothes. His wife will be a spendthrift.