Join Date: Dec 2002
Location: Saint Louis, Missouri
Re: 1969 Fuse Block Batt terminal
Here's how I'm thinking it works (and I tried doing a search for a picture of the backside of a fuse block but I didn't see anything out there).
On the far left the three clips labeled 20A are all joined together on the backside on a buss bar. To the right through each individual fuse the right side of those fuse clips go to factory individual circuits (CLK Clock, LTR Lighter, CTSY Courtesy lights) and this right side fuse clip is jumpered on the backside to the BAT terminal in the middle of the fuse block. This BAT terminal is fused at 20A. The other battery fuses for the TAIL, STOP, and HAZ do not have spots to tap off of those fuses.
On the right side of the fuse block you have a 10A fuse labeled RADIO and the center terminal marked ACC is tied to that fuse. This terminal labeled ACC is fused at 10A.
Further down on the right side you have a 20A fuse for DIR.SIG Directional Signals and BACKUP Reverse lights. The center terminal marked IGN I believe is tied to this fuse. This terminal would be fused at 20A.
On the bottom you have a terminal labeled LPS with a 4A fuse next to it and this fuse marked INST. LPS. Instrument Lamps. The LPS terminal is fused at 4A.
I've seen added on factory designed accessories like cruise control and rear defroster plugged into the center tabs and these do not have inline fuses on them so it has to be protected by an existing fuse in the fuse block.
I know years ago I used to have all kinds of things plugged into these center terminals and if I overloaded the circuit, a fuse in the fuse block would blow. The factory designed plugs are also keyed to where you could not plug it into the center BAT terminal is if was designed to be plugged into the ACC slot.
I've since gotten wiser and know now that the factory design is limited as to what you can do with it. If you are going to add electrical devices to the factory center terminals, be aware they can only take so much. If you need more, then you can use the center terminals to activate relays and other circuits that will get their main power from the battery itself.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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