The few considerations I had for performing the modification was:
- Minimal changes to the original equipment (with the exception of removing the stock horn)
- the Hella horns to be too big to fit through the gap into the space between the radiator and the front grille, making this install tougher. There was many other ways, e.g. removing front grille, removing entire front bumper etc. I finally settle on using the access that the fender liner gives (read page 301 of the G10 Altis user manual). The method of locating the horns will be through a string lower from the gap and tied to the horn that is positioned through the access from the dismounted fender liner.
- there was already cabling provisions for a second horn on the driver side. I guessed also that since the cabling was provisioned, that Toyota would also provide the relay required to drive a pair of horns; the manual vaguely refers to 2 fuses in the engine compartment (Nbr 7 - 50A and Nbr 30 - 10A on page 293 and 294 respectively of the G10 Altis user manual). This will save the need for additional wiring. Almost plug and play.
1 hour 15 minutes
- Hella Supertone horns (Qty: 1 pair 300Hz/500Hz) – [$55.00/pair, Lian Siong Corporation Pte Ltd, Blk 633, #01-120 Veerasamy Road Singapore 200633. Telphone: (65) 6296 4550]. The horns package comes with a SPST relay that consists of a coil (terminals 85 & 86), 1 common terminal (30), and one normally open terminal (87). This relay will not be used.
- M8 hexagonal bolts with washers (Qty: 2) – [$0.50, regular hardware stores]
- Wire terminals (Qty: 2 females + 2 M8 rings) – [$0.30/ea, Sim Lim Tower electronics shops on the 3rd level]
Tools & Supplies
- Crimping tool (if you have one, otherwise use the pair of pliers)
- Hex ratchet wrench or ring/open/adjustable spanner sized for M8 hexagonal bolts/nuts. Typically this is a size 12mm socket. 10mm socket are also useful for working on some of the other bolts in the engine compartment. So, it might be good to have a 10x12 ring spanner/wrench handy.
- #2 Philips screw driver
- Wire cutter
- Smooth file
- Scissors or knife
- Torch light (optional)
- Spray paint, black matt
- Fishing line or heavy string
- 16cm of AWG14 wire
My next 2 posts will detail the preparation and installation steps.
STANDARD DISCLAIMER: I do not know if doing this modification will void Borneo Motors' warranty, neither do I warrant the steps that I have used and documented here for suitability or any other purposes