If you have an orig alt w/external regulator, John's suggestion is correct. I'll add: a large gauge red wire from the BAT terminal of alt to the horn relay buss bar. From there to the junction block in front of stock location battery on the radiator support and connected to positive battery post. All of this red wire being #10 AWG. Eight AWG would be better.
If you have a converted system with an internal regulator, then, you need a #8 AWG red wire from the BAT terminal to battery pos post, and the white(?) wire on the connector to dash light. The third terminal gets a jumper from BAT.
Do a search on Alt wiring as this subject has been discussed before.
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