Hello,
Welcome to JustAnswer.com and thank you for your question.
If the trim up/tilt and the trim down are not working or making noise, It would be hard to suspect that both relays are bad. Did you make sure all the wires were reconnected at the battery when you installed it (we usually find that the power and/or ground wire for the trim are accidentally left off when a battery is reinstalled)? If the trim wires are connected at the battery (some models may have the trim wire positive attached at the starter), proceed to the tests/checks below.
I will attach a picture of a typical Mercruiser trim pump. Make sure that you have good battery voltage and ground going to the trim pump (thicker black wire to a bolt on the bracket and thicker red wire going to the fuse block #15). If you have good voltage and ground going to the trim pump, check for battery voltage on both sides of the 110 amp fuse block (#15 in the pic, remove plastic cover #20 if needed) if you have voltage on one side and not the other, the fuse block is blown, also make sure that harness plug (#3 in the pic) is secured, you may want to unplug and securely replug this harness plug....
Let me know if you need further assistance. I am at work but I will try to respond as quickly as possible.
Thanks again for your question.
Service Manager, Master technician
Service Manager, Master Mercruiser, Master OMC Cobra and Certified Volvo Penta Technician