Re: Henry's 37 Limousine

Posted by HH56 On 2016/8/31 13:39:14

Most horn relays need a ground to operate so you would have to wire the switch to connect to ground when turned on instead of providing voltage as it normally would. No idea if your loom is set up for that change. If it were mine I would just buy some relatively inexpensive 30-40 amp cube type relays that are all over ebay. You can wire those directly with quick disconnect terminals or get a socket and plug the relay in. If you go the socket route, get a good one. Some of those cheap sockets that come prewired have really crappy and undersized wires that make you wonder what standard they used to call the wires a certain gauge.

You can use a single switch to control relays in parallel if you want one for each fan or if the relay is one of the cube type 30-40 amp capacity, then with only needing less than 20 amps use one relay and wire the fans in parallel. You could also add one of the thermostatic switches in parallel with the manual switch to operate the relay and turn the fans on only when needed. Keep the manual switch off unless there was a need to override the thermostat. If you ever added AC the relay could also be wired in to turn the fans on when AC went on.

The fuel pump draw is very low. Do you remember the brand? IIRC, Airtex wants their pumps fused for 10 amps.