A few tips for ya Ron,
All on the cheap....
1. Replace the poor (stock) ground line from the battery to the chassis with a 4Ga ground line. (cost around $6 at most auto stores)
Include a good clean star washer underneath the screw that holds it to the chassis.
1a: Check underneath your dash, left side, there is a ground loom.
This is part of the ground to your wiper circuit. Be SURE that all connections AND the loom itself makes good chassis contact.
Doesn't hurt to loosen the nut that holds the ground loom "a little", twist the loom while it's somewhat snug in order to help the star washer (that sits behind it) "bite" into the metal a bit. Re-tighten afterward.
2. Run another 10Ga wire from the Pos. of your battery to your fuse block. This essentially doubles the current to your car.
You'll need about 3 feet of Brown (or Red) 10Ga wire and a large female Spade connector to do this.
If you have an 1984 or later car, the fuse block contact will be in the forward left hand side of your fuse box area. (big brown wires there.)
If you have a 1976 to 1983 car, you'll see a large white junction block inside your fuse box area. (again, to the left)
In all cases, the large female Spade connector will plug into one of these spots.
Cost is (again) around $10 (you probably have to buy a larger piece of 10Ga wire to get what you need) for this addition.
Fishing the wire from the battery through that damned rubber seal is the hardest part.
3. (Most involved) Make a relay box setup to aid your wiper motor. (You already have the instructions for that) But before you do,
Check the results of Mod 1 and 2. You might be satisfied with the result. But I see your wipers appear to have a heavy draw.
A note:
The headlights are the heaviest drain on the X1/9's wiring harness.
The windshield wipers are the second heaviest.
Some might argue their Stereo is the heaviest, and they might be right. :whistle:
FYI - Your Wiper mod (insert) looks fantastic. Take another look how it's wired, or send it to me for a fix.
Be sure the relays have an adequate ground to the coils. (I don't see a separate ground in your assembly)
Let us know how you make out.